M P M E P J E M J P M E P M J E P M J E P M J E J P M E J P M E J P M E P M J E P M J E P M J E J P M E P M J E thema ISN J E P Ma J E P M J E P M J E P M J E P M J E P M J E P M tical J Physic Electr onic Journal 1086-5 olume P ap 9, er 203 3 ed: Editor: Reciv V E. Ma W y a 23, 203, Revisd: Aug 5, 203, Aceptd: Aug 15, 203 yne INV INV ARINT MANIF ARINT OLDS SUBP A ASOCI CES WITHOU COMPLENTS: A Abstra ct. W of in tenc v in arin t v In use the t tras to the the subpace. w do W e to also W pro to More other v pro e metho genral e wn alo v ned w e d oin ts h of to pro maps v e exis- tange v the arin in t to v do not is arin a t as- sp ectral under the t. of the dominace op erato resticd condits. theorms o e map complen ectrum usal w linear space t sp theorms, the the in tha for theorms suc for uniqes result of tha an the some v kno e satie p space ha not space e used not do the est ondig Inde, linearzto metho xed linearzto. b coresp VE transfom near the ORM CH LA graph of tha A LA manifolds subpace con sume e arin ARINT TRANSF O DE TO INV GRAPH APR R. TED and sho w ho w this can b ha ws. v e b en d. 1 pro v ed in [CFdlL03a ] b y an- e 2 R. 1. If X is a Banc morphis h ther existnc space of F y in the Thes man v v : X e ! theorms X in arin t linearzto of clasi Lla oductin and manifolds la Intr space are of de the under F theorms (0) = 0 is a literau F at F lo cal dieo- establihng whic h are the tange t to in v arin t 0. usaly asume tha ther is a decomp osi- tion (1) X = E E 1 whic h is in v arin t under D F (0) 2 (often the space E are 1 subpace for D F (0). (2) That D F (0) E = E ; 1 and suc h tha they ; sp ectral 2 is: D F (0) E = 1 satify the E ; 2 dominat 2 condit: 1 (3) k D F (0) j k k D F (0) j k E The conlusi for of a the comparisn can a in diern t manifold W in v 1 : 2 clasi of nd < E 1 in v v arin t arin arin t t manifold theorms manifold (Se theorms) under F , [Rue89] are tange t to E tha at one the orign, 1 so tha one can think of W as a no-liear anlogue of E . 1 The goal and of (3) in result, this the pa stable 3.1 (3). The is and Theorm and er to w eak en somewhat pseudo-tabl manifold only neds Theorm the 3.1 as con h tains yp condits (2) theorms. othesi w result for The eak er stable v main ersion and of (2) pseudo-tabl manifolds. More explicty , w e wil asume tha the space E is in v arin t under 1 the map, but under D tion w F e (0). wil not (in coresp ted w to (3) presn tha particul, onds dominat asume sp ectral hap her, e decomp wil F wil or most of to tha w the e is the wil on in v arin t decomp not result asume osi- asume tha stable manifolds tha 1 k (1) asume Also, suÆce (4) ositn not subpace). ens. it the 2 A k A k < 1 : 1 2 (wher A are 1 (9) for a In v ; v arin t, men Some for the c eign v ap alue F linear to the space a or is a to blo c E v in , ev t in w v resp y v ; ectiv ely , se 2 v alues are: pro of of duct a space no cur trival b index Se in sytem, o genratd smalet withou ew t space. subpace sk complen alues the tary t t if complen arin a arin eign en eign arin v the k genralizd in naturl an ciated Jordan the no wher in withou aso or { ther ear a space k. situaon ts A denito). space as blo in of precis t naturly the resticon 1 more arin Jordan the 2 { v Example arin 3.7 is bifurcatons t comple- y In of sytem with us nilp signca tly As a tha motiv sytem. W e b in ma y a unit y the Henc, in is in ues to their v of arin t stable her are wil t nite motiv for result lift wn pa of the eign . v In al- [dlL97 discuon ] of result on are t slo w wn co v existnc based wil of in v er the the strong The arin ts graph usal ones. kno adv the of with pro the ofs pre- graph { to ys trans- space, the tha, foliatn pro in One w a y using some of do ofs. this theorms in since es the the a result not , w el pro obtain v ed foliatns result e a t pro of er in metho d e than pa exampls. ] ers {. for with les [CFdlL03a pa usefl p with er pseudo-tabl are of those b ] The on d man- particu- [CFdlL03b regulaits) could transfom pa result metho t in and the the note arin manifolds. fractionl discuon t v h, aplictons for and The thes ofs, (excpt in whic t. of use of space, complen simple the existnc arin parmets ] se on v Nev gen- has sev- erthls, eopl more famil- parmetizon ]. tha a v hnical [CFdlL03a ol h simplfy one in ha presn graph of t Banc is out, tains her tec the the d not of space [HP70], [CFdlL03a tages tha es arin genral ted in an e v with those y h turns con ery conerd and than in on presn manifolds hop v to is genralit do in endc result pla also [JPdlL95]. requid ] also ofs tha the it ] dep [CFdlL03c One pro Banc liftng in to not metho of sytem, to manifolds pseudo-tabl in [CFdlL03a the The orking the er are iar no-liear e presn el in to ciated studie e of result e w (As ed aso w e space w doing The eral v the result [HP70]. observ ifolds eral o w imedatly when as lar ab rathe the our devic w to case is ciated slow t result dimensoal ation as closet the equilbrm comprehnsiv presn and presn asuming her, alues the h. e kno to the in space to (In the ergnc caled the aplictons. is The based aproc W in v t alue). aso so agin resona ergnc orign to v v eign v note to the eign more ated in con the manifolds the a theorm ted form { y ergnc the con er d. manifold sen v e ens manifolds to to to of metho con nd pa manifolds transfom the motiv w hap the b asymptoic role this t k tha closet meanig can c arin note alues cirle one v also ondig unit and goal k, of ] in e has (3), blo dominate v c e tha asumption ciate W is giv the [CFdlL03c The aso eign study aplicton sytem. the tracion to manifolds to blo the closet and enig coresp tersing an t alues. the space { Jordan t Jordan t 3 resona eak v con no-trival in an not manifolds no-trival eign linear t and of w a w the cirle, tange it to arin part ws of genratd a o situaon orign t the ation the the oten { v role w in e use [CFdlL03a wil is \c ]. onic As al w norms" e wil or se this w eigh is ted the k norms ey whic tec hnical h 4 R. to ol tha alo alterniv ws es W w e e p ostp in w eak en (3) reason the tro in w the one can fol to and Lla of t consider for impro v main e a (3) result The ofs discuon of with til pro them. Section of 3 the so tha staemn ts wil section. Not a tion k e 4.5 can the 2. W e Remark one notai. subeqn v Se y t some la . wh staemn duce de the Banc h space + C , k 2 N , 2 [0 ; Lip ] endo w ed 1 with the usal uniform norms as w el as the space C with its usal ! F rec het top taking olgy and sup of a C endo complex w ed with a extnsio. Banc h When the top olgy size of based the on extnsio is ! imp ortan t, w e wil denot it as a subindex, for exampl in C . That is, w e denot, when k 2 N , i k k k = C ( U ;X max (sup j i =0 ;: r = k + , k 2 N , j ) : ;k x When D ) 2 (0 ; Lip 2 U ] k r k k = C ( U ;X max ( k k k ; H is the ( D ) C i wher H ) =0 ;: ( U ;X ) ;k seminor (5) H () = sup j ( x ) ( y ) j j x y j : x; W ha e v note tha, when x ~ 2 U ;x = 6= x 0, ~ for functios normalized to (0) = 0 w e e 0 k 0 k H () 2 k k 0 C W e les, adopt k sym b the + Lip ol Of < Lip en ican tly k tak the ters. + 1. easir tha the v for r the y 2. y ho ose to tha for an y 2 [0 suc 2 index ; s r 2 rst N ab b and a = as the result in > ignore the Henc, r regulait exprsion c note case > h ; 1), nev as erth- (5),7 , the 1. ma e Lip arithmec alue read in a tion In w trae en en the Inde, cone Giv v es course, Lip con C ordelin case their reading pro it wher ofs could are b signf- e w orth to . o v e, w e wil denot ( s (6) s ~ ; s s (In the resp notai ectiv ab ely o and and w v = N e, w e 1 note tha + Lip ; when s s 2 N = 1 ; ! , then s ~ = 1 ; ! . usefl wn, mains kno Tw o 2 = e elmn the omit existnc a tary inequalts precis of form pro are ducts) ulation includg (since they asumption are so w on el do- In v arin t manifolds 5 0 H ( ) H () k 0 k + k k H () C C (7) H ( Æ ) H ()Lip W e recal caly tha equal a to 1 () : cuto in functio the is bal of a radius functio 1 and suc zero h tha it outside a is bal iden ti- of radius 2. In is nite ob dimensoal space, vious. whic Simlary h Nev are , smo oth erthls, the Hilb ert { out are of space functios ther existnc of inte or the suc h Banc h orign { dimensoal a cut-o functio space do whose ha v Banc h e norms cut-o functios. space for whic h no 0 suc h in smo terv oth al cut-o do exist. es not ha F v e smo The main result 3.1 case. The h diern t yp in roughly the wing ab the b y 3.1 regulait but y in of closed ]). and in ratios a [DGZ93 stable manifolds map, limted of Theorm out on the space ts fol conlusi as also is resul result since regula is er orates case C (se of pa usal functios temn and oth as y this the cut-o a incorp othesi b { regulait St of Theorm exampl, oth 3. tha or etc. the the W e note pseudotabl are somewhat stable case are pseudo-tabl { case the norms. r Theorm 3.1 r 2 D F N (0) + [0 L = ; A Lip et ] X [ b f1 ; e a ! g Banch , sp r 1 b ac e e. L such et F : tha F X (0) ! X = 0 b . e tha A) Ther e exist a de c omp ositn X = X X into 1 such tha the sp ac e X is invart close d subp ac 2 under A. That is, 1 (8) A ( X ) X : 1 Note tha we do not asume 1 tha X is invart under A . 2 Denot by , the 1 pr oje ctions X , X . 1 A = A 1 Asume over 2 (9) furthemo ; 1 e tha A = 1 we e A : 2 in one also 2 2 ar Denot of 2 the fol lowing two c case B.1 k A k < 1 : 1 B.12 L et s Asume = min tha (2 ; r we ) , have the fol lowing 1 (10) , Denot . Asume Stable C k A s k A k 1 2 we < 1 : ak dominac e c ondit ase: es 6 R. In p articul, if r de 2 la Lla we v just asume 1 (1) k e 2 A k k A k < 1 : 1 2 Pseudo-tabl case B.21 1 k A k < 1 : 2 B.21 The B.2 F sp ac e X admits smo oth cut-o functios. 1 or some r e al numb er 1 s , we have 1 (12) k s A k A k < 1 : 1 2 Then, ther e exist U a neighb orh o d of 0 and a map : U X ! X 1 such 2 tha i) i) is Lipschtz (0) in = i) The 0 gr the gr iv.1) In , D aph aph and (0) = of of the U 0 is lo is stable c dier entiabl iv.2) e In r ~ is the al ly we invart under den d in 2 (6) Remark ~ 3.2 is (10) and w its e can ase radi W e norms in up space, In a yp the in this ~ s r the b for whic norms ounds tha sp c the are the the By ers, (12) of on time v of holds. op eratos ectral ho b an of close in radius osing norm as [CFdlL03a ] eratos. Of thes y adpte the as in op erato, desir to e discuon wil in of indep just of nite are terms are w a norms ulation er for course, adpte asumption pa ase, the eratos. form the c sp the dimensoal elmn tary ectral . pro end use adpte t norm of ertis the is form norm ulation used. of the othesi. Since w staemn e ts Banc ys, s norms. op since erthls, h Nev w ~ any used in triangul trinsc for same of y in e endix construi man more ap er the v the op the r on the and thes to ) adpte at of ref stable C condits ha ks the have: 2 (6) using c (In C we in could arnge blo ectral e norms diagonl sp d of w the norm, den Instead (12), rednig . . s F have: c e orign. invart. ase pseudo-tabl (wher the . c wher at h space. wil w not ork use just a as sp w el ectral form for real ulation Banc of h space the h and yp othesi, for the complex In Remark 3. nes The staemn 4.18 W are v the e an ery y e the in w in v e b eha vior This leads ther yp othesi of h yp othesi of er also pro in the with some in the and uniqes asumption orh o uniqes e case. the b giv Remark pseudo-tabl under neigh uniqe- 4.1 tha and a vide Remark condits case b of d y In of the imp regula- orign. In osing the condits on . apren tly wher the wil them tha obtain y case h ev e some some of in int to are 7 uniqes w at manifolds e manifold case, the pro stable obtain t pseudo-tabl w the arin t describ ho t arin of wil ticpae, case, of d W diern stable it metho ts. v pardo one stable xical space part in of situaon. v F arin t Theorm 3.1 for D for F or exampl, (0) the satie the map F and the 1 it could the hap pseudo-tabl en obtained part { inde aplying F urthemo, w 3.1, w e it the only t e c hoice c of the manifold it claimed from en in the w Section a en the e the manifolds { in p 4.1 obtain hap on erthls, result when e could ends tha pseudotabl w Nev t. in if . { diern ed Ev F genricaly the describ dep map result hoices. duce manifolds far for preation, pro the are uniqes { arbity ens result tha the preations include hap o note obtain limnary w for some for the uniqe se map whic 5.4 { Henc, of h for Example case pre- manifold preation. pseudo-tabl Theorm erfom h tha the Theorm eac the in v 3.1 arin t are v ery uniqe. Remark 3.4 the W result nes for e result thes are rathe p ab ery in v e, it in write v simlar to of is not arin o in the just the W ha v obtains e dev elop also for wil uniqe- one e Note e aplying the tha W result her. y en w w. 6.1 of b Giv sho o Section of used ws w. to for pro tha o the hard t direct for map ts a Section Remark o t argumen to v osible result time inde standr osible straegy some the to tha p obtain to alude manifolds quite wil maps ed tha o it ws is indcate using ho an w this is 6.2 3.5 asumption Note on tha what in is k the A pseudo-tabl k case, other than (12) w . This e do alo not ws mak to e an y consider 1 maps wher (13) k A k 1 : 1 Of course, due to (10) , w e ned tha the p osible expansio of A 1 1 is dominate b y the con tracion of A requing 2 (notice tha s 1). tha in (12) w e are 8 R. Ev en if stable it is not stricly manifolds the case wher can (13) in the [HPS7] b t no v plemn elt y t, esn Remark pro impro v to r e the standr One p tion en study of genralit pseudo- y eÆcien tly establihd b b ds in y (13) since the to metho ds her graph in v the ]. of in trans- W95 tha of t the [dlL asumption presn y [Irw80], simlar the e Inde [HPS7 ], arince of the the com- pseudo-tabl case is of r ~ and in y s v ~ in arin the t conlusi theory on separt do manifold conlusi a the tric the [HPS7]. use requi in functor w in regulait b quite of in to e is al of as comn sem v er v The quite in of more metho pa same 3.6 is , los study other remo the the y this the but tialy This b in is e ha and treamn only e case. manifolds in v withou can stable Pseudo-tabl form Lla necsary asume fails the la logicay one discue de the literau. In Suc h one b to r 1 argumen ts often elong. erthls, from t. particul, not Nev manifold argumen es . use + Lip are v the ery tange t k. osiblt y satied b for y suc the h an rst argumen t deriv ativ e is { to it deriv is e a a functioal linear equa- equation on the r ativ W deriv e e. ref Then to argumen h this simple do fol also the for impro v e { of of ts sharp t this a y equation are simlar o situaon. cur in ]. W e 3.1 the xe d and Consider aplies result such X tha the = line in and the [CFdlL03a ] do clasi aply the- { is 2 R and a arizton at C map the F orign 2 1 C 1 = 2 1 B C B C 1 = 2 = : B C @ A 2 = 5 1 2 Note tha 1 = 2 > 2 = 5 le 1 = B A , is: 0 1 > 1 = 3 > wil 5 3.7 . Other [ElB01 wing. Example 1 C her. Theorm course in regulait emn wher not solutin argumen giv exampl orems tha ] whic purse A w [CFdlL03a ts not sho (1 = 2) . = 3 aving the orign the In Ther efor (as e, wel l The as or em others b 3.1 ase v arin t manifolds aplies d 9 to on the eithr same a = f ( x; 0 ; 0 ; 0 ; 0) j x 2 R g X = 1 f b f ( x; y ; 0 ; 0 ; 0) j x; y 2 R g X = f ( x; 0 ; 0 ; t; 0) j x; t 2 R g X = f ( x; 0 es not ; to 0 ; 0 ; take the ondig u ) = 3 j x; 2 = 5 . suc u h t 2 R to w et as g (0 = ; t; 0 ; u z ; y ; ; z ) j t; ; f (0 ; y ; y ; u 0 ; z ) u ; z j ) t; ; z j t; ; y u t; ; 0) j 2 u u y R 2 g R 2 ; Remark 3.8 g R g z ; t 2 R g : to note thels, the ar if and the ear c or e- naturly time one Jordan map blo resonac man adjoin e eignvalus ap trival at c k. Un- sem y to empircaly kno v are b wn, e but tical ], than a particul, w 3.7 er sytem e with do not go blo [ElB01 ], gap ha = 3 v e h ks. [CFdlL03a ] w e aplied replacd ha v the b throug whic c condit could 1 { Jordan [dlL97 rathe Example master-lv iden of h pa literau has result whic this e the linearzto the to of sla the In ers result no in the tha in pa a 2 ac The caled and condits. those e = ck. 3.7 ertis are situaon no-resac e blo Example of { e v 1 eignsp phenoma. elctronis W also of ha master in of the resonac. explantios the ens ck or ap pro vidng 3 dan with often blo = osiblte in sytem geomtric pro When p 1 Jor couplings hap aply e consider the ard to no-trival wil el the ondig mor a of triangul sytem. sult ; under esp anlyzed er often (0 f X invart or those rigously Up e c ourse, sytem w y c maps resona step ac e had one derstanig not Of have time an sp ac would System the a eignsp to 1 a z 2 suÆc of f = 1 as ; d X , y 2 d 5 ; = 1 = (0 c X 2 splitng 2 c sp lowing b = 1 or fol 2 X It the as) a X it of ide y with 1 suc = 7. h re- Nev a c e er- hange. Remark 3.9 Note tha the equations (10) and (12) ha v e the same form. Roughly sp min um satify of the In the the to case, satify the the y only e stronge w e to certain giv the n is of tha y b of y um b ers the s tha is large a to orde e s , the eas- y enough gen uine the . of the Henc, whic y pro In . limtaon the s s regulait tha on tak regulait map. for (12) e the the false due in w for is en limtaons manifold set large limtaon tha, the the limtaons regulait y is asume and tha (12) the considerat ned e the regulait for map the for than Another v case, for b ha obtained (12). Henc pseudo-tabl limtaon ma the or e . come In of (10) w (10) conlusi y y in stable is regulait regulait condit the ier eaking the of stable go of the h es map. case, throug, the 10 R. pro of w usal e presn t go es dominat is to the la throug s fact Lla v with condit relatd de tha s = 1. the e = 2. The This is reason wh noliear part w y of eak w er e the than can the tak map v e s = 2 anishe to i orde s This . If w e observ had D ation resonac N is (0) e N wil b e in a discu In e ned this to section the presn t rst the e pro pseudo-tabl tion and ha anlysi v e wil 4.1 e e . under s extra k no- to higer h orde. W e v anishg of s N do es not help 1. 3.1 the pro stable of of case are Theorm and based 3.1 then, in the the w same ork, W pro of e for the functioal nev wil equa- erthls, the nal t. this section, problem w tha simplfy e can cary b subeqn t out e p some prelimnay erfomd withou los of anlysi. write D F F Cleary , N With (0) = resp 0, ect D to N (0) ( (0) the = x ) = A = Ax + N ( x ) : 0. decomp ositn X = X X , 1 w e can write 2 A B 1 (14) A = : 0 A 2 W e wil asume withou los of genralit y tha k x k = max k x X k ; 1 k x X k 2 X 1 2 F urthemo, b y c hangi k to k = k with X suÆcien tly X 2 2 X 2 large, w e can asume tha (15) k B k X ! " n um As b is er a of consequ arbitly smal. condits of 1 Later tha " in (15) has w the to e " X 2 wher pro ha satify v of w e . e: k A . whic anished preatoy the They e transfomi Theorm ofs diern of y W the In genralit h, tak detail. of t comn rathe Prelimnas. preations v to whic e condit pro some b suÆce ] in of for Both ould mak orde presn of case. w it ts of wil it [dlL97 clasi Pr , tha emn the use w k can so v case, just one form impro 4. In tha normal pseudo-tabl w i in ws thes the and for exploitd sho to not 0 furthe condits mak = k max k A k 1 ; k A k 2 + " wil imp ose a nite In As standr in in v arin v t arin t manifolds 1 manifold theory , w e observ e tha if w e in- 1 tro duce a scaling F ( x ) = F ( x ), w e ha v e tha D F (0) henc noe the of same the pro can D F (0), previous time = ertis arnge b y of taking the linear big map are enough alterd. A t tha r (16) k N k C ( B " : ) 1 Henc, w and e wil asume, withou los of genralit y tha w e ha v e (15) (16). 4.1 Pr case, ep w ar e ations for ned a the pseudo-tabl furthe c reduction tha ase. In alo ws the us pseudo-tabl to asume tha N r is C smal in X B ( 1 the orign in X X ) 1 . Giv wher B ( 2 en a X ) 1 cuto is the unit on X , 2 the bal cen terd at 2 functio it suÆces to consider 1 maping ~ F ( x ) = Ax + ( x ) N ( x ) 1 r Since w e radius ha 2, v e arnged the b Leibnz y scaling form tha ula for N the is deriv C smal ativ es in of pro the bal ducts of and the ~ form ula the for bal the of pro ducts radius of H older functios sho w tha F is smal in 2. ~ Note tha the map F agres with the map F in a neigh b orh o d of ~ the orign. in v Henc arin t As w for e stable a F wil whic h is in v arin t for F , wil b e lo caly . se case, manifold later, wil the b e uniqes result uniqes establihd result for for the manifolds the in v pseudo- arin t under ~ F and whic h satify some condits on the b eha vior at 1 . Since the ~ construi of , it is F quite p out of osible F in tha v olv es the diern t c c hoice of hoices of the cuto wil functio lead to diern t in ~ v arin t manifolds for manifolds for 4.2 A F functioal v x t equation standr If diern = ariton ( ; and, for of y F henc, diern t lo caly in v arin t . ( y ) the is the graph a p in v arince. W transfom oin t in metho the graph e fol w a rathe d. of w e ha v e F ( x ) = A y + B ( y ) + N ( 1 wher N , N are 1 The ; shortand for t y ) ; N , A ( F question ( x of ) is y ) + N ( also ; ( y ) resp ectiv ely . 2 in domains y 2 N 1 tha moen ( 2 2 condit the y 1 the graph on of wher the reads comp { ignor for ositn is den{ (17) A y + B ( y ) + N ( 1 The ing equation (17) question y ; ( y ) = A ( 1 of is, furthemo formaly domains of y ) + N ( 2 equiv denitos of the y ; ( y ) : 2 alen t functios { agin { ignor- to 1 (18) ( y ) = A ( A y 2 1 + B ( y ) + N ( 1 y ; ( y ) ) N ( 2 y ; ( y ) : 12 R. Remark 4.1 tainly The not equations h argued in notis v e v slo w la equiv se v diern t b e et dep and ha of lead solutin y one v e the to tha (17) are diern ob t y diern t jects. Se formal the cer- diern solutin. wh t same on t reason diern the endig (18) uniqes, ma is manifolds en discu t, this exmplify w e alen ] t w e w equiv arin v when [JPdlL95 in Lla alenc wil formaly wher ery e W95], 5.4 ha w are [dlL of Example of As whic As isue trival. de also equation precis ma requimn y ts on domains. W e W e wil study (18) denot b R.HS of (18) as y T . a the xed op That p oin erato t problem. whic h to a functio aso ciates the is 1 (19) T []( y ) = A ( A y + B ( y ) + N ( 1 y ; ( y ) N ( 1 y ; ( y ) 2 2 This op erato is transfom, but pro duce { it for and T sligh The of w on xed p (tha a oin tha The the in e v ofs t T and iden wil on whic sho 1 w a ts w e wil erato consider in man con y the t W ation, duce is also range the a matc e stable the h d the is and pro of h wil case clasi metho the pro el the deriv e in w whic for w tha and fol the of is and formal w diern tracion. t ). functios pro T oin domains them wing of erato p (18) (17) e op xed ers the b of the rev of wil is oin graph op the a tha Both later p the transfom is of fol T and xed tha has to ation space h case wing it us deriv some to graph tha solutin result tify ciated the the erato sho ws theorms e stable of thes manifold W y e { of op the case. arin the alo the pseudo-tabl form. b it ers of the in tha w rev it ts tha w aso [LI83]. consit tha since can pro in h oin functios, sho (17) w is t wil of so presn suc e p of of is w solutin e erato to xed tha space t is, also e.g op relatd e This ofs, pro the closey b simpler. pro den exactly is wil tly clasi not graph map presn t rst of trans- ed pseudo-tabl ofs in the to itself pro case. of The in case ! C and C Section regulait y for the stable case wil b e done separtly in 4.5 4.3 F stable orm ulas and for in Lema the deriv ativ es. pseudo-tabl A result case tha is w the fol e wil use wing b oth purely in the formal 4.2 4.2 in Lema (19) . Asume tha for an op en set of y we c an den T [] as In v arin t manifolds i If is i C , i r , then i T 1 D T 13 [] = [] is C and, mor e over, we have i A D ( A + B + N ( 1 ; ) 1 2 ( A + B D + D N 1 ( 1 ; ) + D N 1 ( ; ) D i ) 2 1 i (20) + A D ( A + B + N ( 1 ; ) D N 1 ( 2 ; ) D 1 2 1 + i A D N ( 2 ; ) D 2 2 i + R ( D ; : : : ; D 1 ) i wher e R is a p olynmia in the derivats of whose c o eÆcients ar e i p olynmia expr evalut d Pr o of. esion at The but is involg form ula signca (20) tly The the derivats of F { up to or der { main p can b e obtained from F a Di Bruno form ula, easir. oin t of (20) is tha w e i can iden tify the only term in i D T [] whic The h form con tains ula as (20) is a factor easily D . establihd b y inducto staring form the i ob vious b i case y i taking = one W e 1. Asuming more note tha deriv tha ativ taking (20) e the on b deriv is oth true, w e compute +1 D T [] side. ativ e of R w e do not obtain deriv ativ es i of of orde higer compute the than deriv i ativ e of . T o the establih tha terms b y R using is the a pro j w e tak e a deriv ativ e of a factor j D , w e obtain e the are deriv of T the o 1 of desir F Æ claims observ when j D w e obtain w e w e When +1 and when +1 D F Æ D . Both factors form. the to + e establih suÆces i ativ olynmia rule. D j tak p duct e w e ab tha tak e out the deriv the only terms ativ w es of a y with tha the w higer e deriv get deriv exprsion is ativ ativ tha, es, es of when it orde w e aply i the pro deriv duct rule, ativ in es deriv on of es 4. of of The 3.1 sp to second on the obtain factor D terms i + 1 whic so tha h . can If are p w e tak e olynmias consider them as when es of r orde stable < 1 case. . v elt In w y e wil with tha The W case r e no = w 1 star ; ! the wil b e ect to in w the of literau w les section, most the functios tly this e in tro duce some later. in the (sligh use resp theorms fact the functios. tha manifold the in 4.5 ac no t of e tha 3.1 norms arin tage er Theorm Section main v w es til and in w lo Theorm Some space ativ factors, orde of oned 4.1 deriv +1 of ostp the . Pro pro e other of R i p the ativ part tak e les the standr is are seking regula pro tha case). v w e anish tak Henc at ofs e of the adv an- w orign e can 14 R. use w eigh ted stronge norms con 4.3) w siton eak the e or pro This en W (2) tracion de impro v Lla norm for ed v e based ertis dominace la con on the op deriv ativ erato tracion es whic h consider pro ert lead to (se y is what Prop alo o- ws us to condit. consider r = k + k 2 N , 2 [0 ; Lip ] and den the space r = Æ ; ;Æ ; : B Æ X ! 1 X ; 1 2 C ; 2 0 k i 0 k D k Æ ; i = 0 ; : : : ; k ; i C ( B ) 1 k H ( D ) Æ ; (21) (0) = 0 ; D (0) = 0 ; s sup y 2 j B f 0 D ( y ) j y +1 j < 1 g 1 wher s is Henc, the same when deriv r ativ as e in 2, (21) tha en the exp is 1. tering in one In t case of r j (10) = 1 y , j in + namely , the , last the s = min (2 condit exp ; r for one t s + ). the 1 is just . When = 0, the parmet in the denito of 0 role since Æ and 0 Æ w ould con trol the do es not pla y an y k C norm of D . Henc, w e wil k 0 just supre use Æ the Henc, notai when dealing with in tegr regulait y , w e wil . Æ ;: ;Æ 0 k W e wil asume tha Æ 1 so as to mak e sure tha N ( y ; ( y ) is 0 alw a ys w el den. W e wil endo w with Æ ;: ;Æ ; the top olgy induce b y Æ 0 k s (2) j j j j j j = sup y 2 j B f 0 D ( y ) j = j y j g 1 wher, w 2 (0 ; It recal Lip is whic e ] not h s and s hard 0 c the tha 2 = to satify Note = whenv er when r hec k = (2) is a (0) top olgy 2, s = when r = 1 + , 1. tha normalizt the r norm = induce b in the space of functios 0. y (2) is ner than the top olgy 0 induce b An y the imp C ortan norm. t result [LI73 ] Lema 2-5 is tha when r = k + , the 0 closure of under C { a forti under the w eak er { r top is con tained in the set of functios whic h are = 0 ; D (0) = 0 and, whic ; i ~ 0 k D k Æ ; 0 i C ( B ) 1 r H ( ;B 1 D 1 ) Æ : i w e consider ~ C satify (0) olgy k ; h, more v er In W e also note tha v when arin t r manifolds 15 2 and the space X is separbl, a 1 v arin t of the Ascoli-rze precomat a with The fol op erations rst ery w w under giv pro of tly the comp tha study frequn y conludes the in norm the b space w con vior of j transfom tha with eha graph (2) ositn the is en. ositn ear ert t olgy o ap pro el top t tha The v the wing argumen e j j j j j under aproc wil use is h. tha it b eha v es tracions. 1 Prop ositn 4.3 L et : B ! B b 1 e a C functio such tha 1 0 (0) = 0 ; k D k C ( B 1 : ) 1 Asume tha j j j j j j < 1 . Then, s (23) j j j Æ j j j j j j j j jk D k 0 C ( B ) 1 The main in the p b oin ound t in of the Prop (23). In ositn the is most t tha w ypical e case obtain r the 2, exp then one the t exp s one t 0 s = 2. Since k D k is C ( B smaler than 1, this is quite w orth while. ) 1 Inde, this or to is (10) the for reason lo w wh y w e can impro v e (3) to (1) when r 2 regulaits. 1 Pr o of. W Cleary e , the estima functio for y 6= Æ is C and it satie s j D Æ ( y ) j = j y ( Æ )(0 = 0. 0 j s D ( D ) Æ ( y ) j ( y ) 1 j j D ( y ) j 1 j s j y 1 s j j ( y ) 1 j " # s s sup y 2 ( B f 0 j D y j = j y j ) sup g y 2 ( B f 1 2 0 j ( y ) j = j y j ) g 1 sup y 1 1 ( B f 0 j D ( y ) j ) g 1 from whic the h it cleary estima fol in Prop ositn (23) ws tha j 4. L et N : X N Æ 2 tha j j j j is nite and 2 X ! 1 X satify 2 = Then, 0 , D the (0) D = 0 0 Lip . L ( y ) = N ( y ; 1+ j ( y ) b satie j j j j j k N 1 k + k N k j C e, as b efor satie j j j j j C e j j j ( y (0 ) j j j = y sup 2 B j f 1 0 g D ( y ) j = ; 0) 2 et . functio N 1+ , 2 wher it 2 C 2 (0) tha 1+ Asume j . j y j : e a C functio, = 0 . 16 R. Pr o of. W e ha v de la Lla v e e j D N ( y ; ( y ) j = j y j j ( D N )( y ; ( y ) j = j y j 1 + j ( D N )( y ; ( y ) j D ( y ) j = j y j 2 1+ k N 1 k + k N k j C j j j j j C Remark 4.5 is mainly W e usefl note tha for the the in case r tro 2 duction 1 of + [0 ; Lip the ]. c In onic al the norm case j r j j 2, j w j e j 2 0 could just use the top olgy induce b y k D k . C ( B ) 1 2 Since w e are considerg space of C functios whic h satify the 2 0 normalizts (0) = 0, D (0) = 0, w e se tha k D k is inde a C norm. F or our pur ose, consider b w e ha v e the eha v impro v es main w ed el pro under con ert y comp tha w ositn tracion pro e ned with ertis is a con tha the norm tracion anlogus and to (23) tha . 2 0 F or k D k w C ( B e ha v e ) 1 2 2 2 0 k D ( Æ ) 0 k k D k k D k 0 C ( B ) C ( B ) 1 1 C ( B ) 1 2 0 + k D 0 k k C ( B D k ) C ( B ) 1 1 2 2 2 0 k D 0 k k D k + k D k 0 C ( B ) C 1 C ( B ( B ) ) 1 1 whic h can b e used in a simlar w a y as (23) pro vide tha w e can mak e 2 D smal. 2 0 Henc, w e could use k D k in the subeqn t argumen ts rathe C than the conial norm. The conial norm j j j j j j turns out to b e some- 2 0 what simpler to estima and, since j j j j j j k D k the uniqes C staemn ts in the conial norm are sligh tly more genral (the space in 2 whic h In is the conial p case norm tha w osible if e N v transfomi is den include consider functios functios anishe to whic h orde are p k , osible tha whic p h v anish are to erhaps after under not orde some nitely C k { ). whic h prelimnay man y no-resac k 0 condits {, it is p osible to use the norms k D k , The pa er [dlL97 ] C includes a thes genral discuon case are norms whic [ElB01 of studie h with also thes wigh norms lead to ted impro and norms v sho ed with ws. con In higer tracion p [CFdlL03a pro o ], w ers. Other ertis o cur ]. in The c 4.2 hec k tha the op er RHS ator of T (18) is wel inde l den dens d in the an op erato sp ac es. on W e . wil rst In W e rst note tha using v arin t the manifolds con v 17 en tions arnged in Section 4.1 w e w e ha v e, for j y j 1, 2 Æ ;: ;Æ ; Æ 0 k j A y + B ( y ) + N ( 1 y ; ( y ) j k A k 1 + "Æ + 1 k N k 0 1 C 0 (24) k A k + 2 " 1 If w tha e imp ose the the RHS Once condit of w e ha tha (24) v e is tha " smaler is than the smal enough, w e can ensur 1. functio T [] is w el den in the indcate r domain, the c hain rule tels us tha T [] is C . Henc, the RHS of (18) can b e den for al the 2 . Æ ;: ;Æ ; Æ 0 k 4.3 The sho w r tha ange of T diern t [ ] er con the on the particul, In tha w get the c ac es set map ondits of sho In or it is but p Section with osible to 4.1 themslv The section, form tha in to this the w duce in . of wil tro ed also e in 4.6 sp another prenomalizts domains Lema T in In with nd ator tained parmets. arnge can op is tha one es. em 3.1 after making the ad- s justmen in Se ction 4.1 so tha k B k , k N k ar C ( B e smal l enough, ) 1 s = min ( r ; 2) . Then, it is p osible to nd Æ ; ; Æ ; 0 Æ > 0 as wel l Æ , satifyng Æ = k Æ = 0 1 , 1 as: i T ( ) Æ =1 ;Æ =1 0 Æ ; : Æ Æ =1 1 ;Æ =1 0 ; ;Æ ; Æ 1 k k r Pr o of. First, it The fact is clear tha b T y the c [](0) = hain rule 0 tha and D if T 2 [](0) r C , = 0 then T are [] 2 just C an . easy calution. W e denot (25) []( y ) = A y + B ( y ) + N ( 1 x; ( y ) : 1 Therfo: D []( y ) = A + B D ( y ) + D N 1 ( 1 x; ( y ) 1 (26) + D N ( 2 W e y ; ( y ) D ( y ) : 2 estima 0 (27) Lip ([]) k D [] k k A k + " : 1 C ( B ) 1 The fact tions tha 4.3 in and Prop F ertis of and rom for of m , ultipcaon, [] j j jT j is nite y m j is erato T j the in v ery easy just to terms form the left b y estima those (27) Prop osi- consider linear op the deriv erato.) ativ es of . y ula case a for of inequalt the of from the obtain of triangle consequ diers in is j a ultipcaon mater [] using j op b the j (20) jT (The 4.3 heart [] j 4. ositn The T j and , the tha Banc for h functios algebr pro- 2 18 R. de la Lla v e , Æ ;: ;Æ ; w e ha v e b ounds on the deriv ativ es, w e obtain tha, when Æ 0 k 2 2 , Æ ;: ;Æ ; w e ha v e: Æ 0 k i i i 1 0 k D T [] 0 k k D k k A k + 3 " k A k 1 C ( B ) C ( B ) 2 1 1 (28) + P ( Æ ; i wher P is a real p olynmia : : : ; Æ ) 0 with i p ositv 1 e co eÆcien ts. i The N co . Ev eÆcien en ts note if w tha e of P wil the p are not obtained use b it olynmia in P this can y estimang pa the b e er { deriv excpt asumed ativ for to b e i = es 1 ; arbitly 2 of { w e smal b y i i asuming tha k N k is suÆcien tly smal. C Simlary , using (7) w e estima the Holder seminor in the unit bal as: i H ( D T []) ;B 1 (29) i + i H ( D 1 ) k A k ;B + 3 " k A k + P ( 1 Æ ; i : : : ; Æ ) 1 i : 1 1 2 The rest of whetr r F or r the pro 2, r 2, of 2 1 asumption whic + , w ; is e Lema (0 h (1) of 4.6 Lip ] the or r w as in 1 b e diern t acording to 1. case, arnge k = main can wil e note tha, Section b 4.1, ecaus of the tha 2 A k D k < 1 0 2 C ( B ) 1 0 k D k < C ( B 1 : ) 1 W e c ho ose Æ = Æ = 0 1 ; Æ = 1 1. Becaus of (28) w e get 2 2 0 k D T [] k Æ + P (1 2 ; 1) 2 C Recaling tha w e can mak e the co eÆcien ts or P as smal as desir 2 2 b y arngi tha k N k , k B k are suÆcien tly smal, w e can arnge C tha 2 0 (30) k D T [] k 1 : C Using tha can use w the e ha mean v v e the normalizts alue T theorm to obtain [] = from 0, D T [] = 0, w e (30) 0 k D k 1 ; k k 1 = 2 : C C 0 This establih the desir result for r = 2. In case tha r = k + > 2, w e pro ced to c ho ose the Æ , Æ so tha i the desir conlusi hold. It is imp ortan t to emphasiz tha the 2 smalne condits tha w e wil b e imp osing on k N k , k B k wil b C 1 indep W end e observ t e of tha, k . This wil w e b ha v e e the for basi k 1 k A of i > the study 2 of k i D k < 0 k 2 C ( B ) 1 1 : the C case. e In Using (28) w e ha v v arin t manifolds 19 e i 0 k D T [] k Æ + i P (1 i ; Æ ; i : : : ; Æ ) 2 i 1 C i 0 Henc, w e can c ho ose recusiv ely Æ so tha k D T [] k Æ . i i C Simlary , taking in to acoun t (29) w k H [ T [] Æ k 1 k k A obtain D wher e k D + + P (1 ; k ; Æ ; ; : : : ; Æ ) 2 k k < 1. Henc, it is p osible to c ho ose 0 k ; 2 C ( B ) 1 also the Æ This . nishe the Remark 4.7 pro W asumption e (1) condit As it lo w w in somewhat the case this w r case, eak w er considerg higer e e than 2. ha v the the orde deuc ha v e estima deriv second deriv tha when of higer a ativ orde ativ e This b e only used usal comp the dominace ositn etr ativ es ecaus functio with estima w y relatd part e con than the lo ha so v e deriv the trac- deriv ativ ativ e es from those tha could estima ativ tha, y of the rst e. b tangecy es normalizt w fact a er deriv the has w tha second to noliear the zero, b course the b at the of e, for tangecy and is, riv es case, the has is in orde. our for 4.6 tion ens, ativ er In Lema aten This hap deriv of of . often tions, cal . (3) of the denito orde of 2 with the de- linear part. The same orde t yp higer e of argumen than enough t 2 orde. if w Inde no-resac e in reduc it is obtain p so tha to condits p out is sho than a tha e are (1) b certain of v ed. higer ecaus exp aribles In deriv the or hig satie hanges presv with es of A c ativ tangecy if mak ts deriv has wn to argumen er using N tangecis simlar eak caried osible orde use w it is hig osible e tha ] it N case, b ensur [dlL97 condits, tha can can suc h ativ one t es of k a and A k is 1 biger than 2. Argumen ts op eratos with a hap W e are en also ref v or but aplied to somewhat diern t ]. Example 5.1 to sho w tha some of thes condits . No w, w case e for F a [CFdlL03a to necsary simlar in or consider the whic h the the range use case r of of = the 1, w the op second e erato T deriv observ e ativ tha in e the is the lo not p w regulait y osible. estima (28) w e ha v 1 0 k D T [] k Æ 1 + " wher = 1 k A k A k 1 . In this case, the as- 1 C 2 sumption in Theorm 3.1 imply tha < 1. Henc, w e can c ho ose 1 0 the Æ = 1 so tha k D T [] k 1 Æ . 1 C Once w e ha v e tha, w e can e R. c 20 ho ose Æ > Æ . 0 T [](0) Using the de la mean v Lla v alue e theorm and the normalizt 1 = 0, w e obtain tha T ( ) Æ ;: ;Æ ; : Æ Æ ;: 0 ;Æ ; Æ 0 k k In the case r = 1 + , 0 < Lip , w e c ho ose Æ = 1, Æ = 0 By the c hain rule, w e ha v e D T [] = ( D ) Æ D 1, Æ = 1. 1 . Henc, using (7) , 1 0 H [ D T [] k A k H [ D ] Lip () k D 0 k + k D k H D : C C 2 Note tha H [ D ] H [ arbitly Henc, w b e D N ] and, since > 0, this can b e made smal ha v y e rescaling. for functios in 1 H [ D T [] ; 1; + " 1 wher k 1+ A k D k < 1 b y asumption. Adjusting tha " is 0 2 C smal enough, w This e nishe W e obtain the the pro emphasiz desir of tha of the result. Lema 4.6 condits of smalne tha w e ha v e imp osed 2 on k B k , k N k , are indep end t of r . The w a y to ensur tha the hig C orde deriv ativ es get trap ed is b y c ho osing the Æ i 2 and Æ en tering i in the denito of the to Æ ;: ;Æ ; b e large enough. Æ 0 k Note ha also v e tha al the the argumen t smaler than relid hea one vily with on the condits fact tha tha w are e indep could end t i of i . This is certainly true pseudo-tabl in the stable case, but wil b e false in the case. Remark 4.8 to the In space case { tha e.g w e when can aply X is Ascoli-rze a a separbl space, theorm w aplied e obtain a pro of 1 of the T yc existnc of hon v The op theorm This T giv es since the e the a h a p the y geomtric of of not obtain case osible t to b argumen in the v Sc Then, as a w ex. arin t mani- On Nev e are erth- ts [Sh establihng u87 ], [LI83 ] uniqe. the stable hauder one refncs v tracion. ertis. manifold e con v con pro pro the ounds. ts in is argumen to aply the T uniqes is hauder- graph. of the Sc cleary closed tha manifold argumen is and, a geomtric stable the existnc tha are the aplying has obtain the the ther proagted the y compat it to in tha space b do tha, is ecaus estima manifold, dimensoal lishe pro b b short just space uos the e (18) the tin oid e establih Henc, ecaus con ery v w observ stable whic v e hand, w is is a w other les, of b erato folds solutin manifold theorm can establih ab for once o the one v e. nite estab- uniqes In 4. Contr action Lema pr 4.9 In with Æ op arin ertis the the v c norm t of manifolds 21 the ondit op of (2) er L ator T ema on 4.6 T . is a c ontr action on . Æ r 0 Recal tha 1 D T []( y ) = A D A y + B ( y ) + N ( 1 y ; ( y ) 1 2 A + B ( y ) + D N ( y ; ( y ) (31) 1 1 1 1 + A D N ( 1 y ; ( y ) + D N 2 ( 2 y ; ( y ) D ( y ) 2 2 ~ b F rom y (31) it ading wil b and W e wil use tha a al ula j As ignor form straigh (31) tforw terms 4.10 tha, rathe subtracing also Remark e j the 1, k jects k 1, ativ k b amoun j k the can e D for tha deriv estima j jT [] T [ ] j j j . guide ob to aproitely heuristc the for y ard 1, k D subeqn e ts k t made estima is arbitly to 1. smal, the just 1 (32) A D ( A ( y ) A : 1 1 2 As w e wil wil b con se, e since al obtained b tracion in The con y (32) the of W are and smal, the subtracing pro of terms of con from tracion the pro of of . tracion estima. terms ading e ha v (32) is pro v ed using the impro v ed con tracion e: 1 1 ~ k A D ( A y ) A A 1 D ( A y 1 ) A k 1 2 1 2 1 ~ k A k A kj D ( A y 1 ) D ( A y 1 ) j 1 2 1 ~ k A k A kj j j j j j A y 1 j 1 2 1 2 ~ k A k A k j j j j j j y j : 1 2 F rom (32) the is No a ab w con w e estima, to j wil j j ws tha e other main part of T (as in for to wil pro ha v terms adjustmen the . try w the the j fol estima e but al with j ving w 4.10, temaicly j pro eaking Remark smal it in turn sp the v tracion e Roughly o in ful ced e T along to pa whic ts the y h not the aten just lines tion wil Section and . indcate to turn (32) in estimang out sy- to b e arbitly 4.1 ~ ~ 0 j D N ( y ; ( y ) D 1 N ( x; ( y ) j k D D 1 N 1 k j ( y ) 2 C ( B ) 1 (3) 2 ~ A forti, simlar b ounds are true for " N j j 1 , j N in 2 j j j place y j : of N . ( y ) j 2 R. More v de la Lla v e er, ~ j D N ( y ; ( y ) D ( y ) D N 2 ( y ; ~ ( y ) D ( y ) j 2 ~ j D N ( y ; ( y ) j D ( y ) D ( y ) j 2 ~ + j D N ( y ; ~ ( y ) D N 2 ( y ; ~ ( y ) j D ( y ) j 2 ~ wher w e ha Again, v w e e " j j j used j agin note j j y j (3) tha, to the estima same the second estima factor. remain v alid for N , N in 1 place N W . e denot b []( y y ) = A y + B ( y ) + N ( 1 D []( y ) = e y ; ( y ) 1 A + B D ( y ) + D N 1 W 2 ( 1 y ; ( y ) + D N 1 ( y ; ( y ) 2 estima 0 k D [] k k A k + " : 1 C ( B ) 1 Henc j []( y ) j j A j + " k y k : 1 More v er, w e ha v e ~ j D []( y ) D []( y ) [ [ ~ ]( y ) j " j j j ~ j j j j y j ~ ]( y ) j " j j j j j j y j ~ The only terms left to estima in D T [] D T [ ] can b e exprsd as 1 ~ (34) A ( D Æ []( y ) D []( y ) D ~ Æ [ ~ ]( y ) D [ ]( y ) : 2 The in norm the of (34) is denito of j j b j ounde j j j b y (w e recal tha s = min (2 ; r ) en terd ) 1 ~ k A k j D Æ []( y ) D ~ Æ [ ]( y ) j D []( y ) j 2 ~ + j D ~ Æ []( y ) D ~ Æ [ ]( y ) j D []( y ) j ~ + j D ~ Æ [ ~ ]( y ) j D []( y ) D [ ]( y ) j 1 s 1 ~ k A k j j j j j j k A k + " j y j k A k 1 + " 1 2 s ~ + j []( y ) [ 1 ~ ]( y ) j k A k + " + " j j j j j j y j 1 1 s s 1 ~ k A k ( k A k + " ) + " j j j j j j y j : 1 2 Colecting the Remark 4.10, previous estima, the op erato w T has a Lipsc e obtain tha hitz consta as t indcate in in j j j j j j whic h 1 s is k A k A k + " . By the asumption in Theorm 3.1, this is a 1 2 con tracion on . Æ ;: ;Æ ; 0 k Æ Henc, w e obtain tha ther a xed p oin t In of T { therfo a v solutin arin t of manifolds 23 (18) { in the closure of for the j j j j j j r Aplying Lema Henc, 2.5 w case k A e k ha < v 1, in e [LI73], w establihd r e conlude tha the 2 N + [0 ; Lip this conlusi xed of p oin Theorm t is 3.1 . ~ C for . the ]. 1 Remark 4.1 W e note tha, since w e ha v e used a con tracion argu- men t, w e ha v e sho wn tha ther is exactly one xed p oin t in , Æ ;: ;Æ ; Æ 0 k wher denots Note the tha if ` closure > in the top olgy w e consider. k (35) : Æ Æ ;: ;Æ ;Æ ;: Æ ; ;: ;Æ ; Æ Æ 0 k 0 k It is imp ortan ularties is hig w to b are when e e r w e tak the the not e for In diern this lo w t w a y orde. , reg- the In tha con a ed is on e 's space in map tak . of obtain tracion end w Æ Æ this of w get a y map , ed (35). This dep when Æ the in space 2. the y the to of regulait condits r hoice regulaits, as get do tha c hangi con for e Notice t establih to tha in the only higer our c nestd tha w condits with tha diern are also { ` inducto consider Notice the y +1 withou es r realiz ade themslv with to done index in t k b do w to ativ y do the es not c hange { hange and eithr asumption than (1) c norm smalne higer asumption not regulait itself ecaus deriv the in tracion lo , the w e second. obtain con tracion 2 only on C space Example or 5.3, this 2 uniqe W are e it 2 o furthemo in is observ v t osible e to y Ev en in obtain y b enough whic if . As w case e wil tha w intely b y e se e man y previous uniqes in obtain a manifolds in atrcion in set of the wil basin b Their the obtain of tained ounde iteraons. h, w basin con an taking tha the manifolds with ifolds, p to arin terscion bal . . proagtes w regulait sharp Æ C uniqes t higer is manifold, 2 h with Æ C whic space conlusi of e ev en images a bal, Giv atrcion, en their map also ed b staemn the orign. tualy wil uniqes the t e in v wil in- in to arin ha the t v e to man- agre. 4.5 Pr o of of The or em 3.1 in the stable c ase when r = 1 ; ! . The case 1 C is a v ery simple consequ of the observ ations made in Remark 4.1 W e note tha, w e can nd a sequnc f Æ g suc i k 2 N , is Æ ;Æ ;: 0 map ed in to itself to T i 2 h tha, for ev ery N and T is a con tracion in ;Æ 1 k the distance Becaus j of j j j j j . the nestig (35), the xed p oin ts in those space T ~ to k coinde. The xed p oin t, therfo is in C k = 1 C . ha v e 24 R. The anlytic space case and space w are e is recal v ery tha anlytic de la v simple. e W diern (se Lla e tiable [Kat95 ] w ork in a functios complex in a complex Banc h Banc h ). 2 If w e cary obtain out tha the the C pro functio is of as ab diern o v e, tiable but in in the a complex unit bal, bal and, w e therfo anlytic. 4.5 Pro fol of ws w e v ha pro v er tha w X this Æ e in v e stable case. and in man of y tha of wel no w w e a e ys erthls the somewhat simpler to wil of Inde, in the con manifolds, w pro Nev norms. used pseudo-tabl and l den not d. ha den to turns, is e is ha the The traciv so not ha v e to e tha the distnguh regulaits. w Henc, is norms case T tha in space ard ator is case. of of straighfow t op case pro hoices ted the more diern The eigh for e of ensur w usefl b case stable c Pseudo-tabl case of not the the t pseudo-tabl wil 4.51 in as diern devics ofs the e the are pro lines mak the case 3.1 simlar to of since Theorm ery e of of v in e a consider us bal if D diernc j of to main j space forces The tha < Henc, w the e canot is. functios consider with 1. den in no-liearts N the whole tha are uni- 1 formly smal on X B ( 1 in Section X ). 1 This is precisly what w as acomplished 2 4.1 W e wil, smal therfo in X asume B ( 1 X in ). 1 In the this fol wing tha N cirumstane, the is op den and erato T is w el 2 den. Some v 4.52 ery sp simlar W ac es to e of the consider functios. The space r = k + space tha as w e usal tha w consider e in and consider wil consider are Section 4.1 the space (36) r i 0 ~ = Æ Æ ; : X ! Æ X ; 1 2 C ; k D k Æ ; 2 i = 0 ; : : : ; r ; i C ( X ) 0 1 k k H ( D ) Æ (0) The space den in ~ the dier from whole the space X = space b rathe 0 ; D (0) ecaus = than the just 0 g functios on the in unit ~ are bal. 1 The main tec hnical diernc with the space ~ is tha w e consider 0 the ~ space endo w ed with the C ( X ) top olgy . 1 In the pseudo-tabl case, w e wil not use w eigh ted norms, since in 0 this case, the extra factors k D k than C do 1. not help since they are biger In The anlogues whic h of are rathe Prop ob v arin t ositn manifolds 25 4.3 and 4. are the fol wing result vious. 1 Prop ositn 4.12 L et : X ! X b 1 e a C functio such tha (0) = 1 0 0 , k D k C ( X 1 . ) 1 Then, 0 (37) k Æ 0 k C ( X k k : ) C ( X ) 1 Prop ositn 4.13 L et N : X 2 1+ Asume tha N 2 1 B ( 1 X ) 1 ! X satify 2 D N (0 2 1+ , 0 Lip . L ; 0) = 0 . 2 C et b e a C functio, 2 (0) = 0 , Then, D (0) = the 0 . functio ( y ) = N ( y ; ( y ) satie 2 0 k 0 k k N k : 2 C ( X ) C ( X 1 4.53 The r anlogue ange of in w e wil the se diern op er ator T pseudo-tabl the t the due to on ds the are fact ( v of tha, ery p X ) 1 the case metho B 1 sp 2 ac the es ~ . result ev k section in simlar osibly This A en k Section if an 4.3 the 1, is As conlusi are henc hig p o w ers of 1 1 k of A are not con tracions and k A k A k 1 wil not b e a con tracion 1 2 for hig k . Lema 4.1 In the c ondits of The or 1 k em 3.1, asume tha r A k A k < 1 : 1 2 Denot r = Then, k + after as usal. making the adjustmen in Se ction 4.1 so tha k B k , 1 k N k is smal l enough, it is p osible to nd Æ ; : : : ; Æ ; 0 C ( X B ( 1 Æ = Æ 0 X 1 Æ 0 , is such a way tha i T ( ~ ) Æ ;Æ 0 Æ ; ~ : Æ Æ ;: 1 ;Æ ; of. The pro Lema of is v ery Æ 0 k o , 2 , 1 Pr Æ k ) 1 = k simlar to { but simpler than { the pro of of 4.6 W (w e e just note just tha, ned b to c ecaus of hange the (20) w domains e ha v wher e w a e direct anlogue cary of out the (28) estima). (38) i i i 1 0 k D T [] 0 k k D k k A k + 3 " k A k + P ( 1 C ( X ) C ( X Æ ; i : : : ; Æ ) 0 i 1 ) 2 1 wher P is a 1 real p olynmia with p ositv e co eÆcien ts. i W e also ha v e an anlogue of (29) just c hangi the domains. (39) i i H ( + i D T []) H ;N ( D 1 ) k A k ;N + 3 " k A k + P ( 1 1 Æ ; i 1 1 Henc, 2 w e pro ced b y inducto asuming Æ = 0 1 ; tha Æ = 1 1 : w e ha v e set : : : ; Æ ) i 1 26 R. As in the con traciv e case, w de e la just Lla v e note tha this can b e arnged if w e 1 arnge tha k N k ; k B k are suÆcien tly smal. C Asume inductv ely tha w e ha v e detrmin Æ = 1 ; Æ = 0 Then, c ho ose Æ in i suc h a Æ i = k y 1 ; : : : ; Æ , 1 i tha Æ i i A +1 1 a +1 (40) wher w k + +1 P ( i i Æ ; +1 : : : ; Æ ) 1 1 +1 k . 1 i +1 2 C This c hoice of Æ satifyng i By the < i (40) for i k p osible pro vide tha < i in 1 is +1 asumption Theorm 3.1, w e se tha w e can 1. +1 adjust tha . +1 It is clear tha if Æ satie i (40) and T ( ) +1 Æ ;: , ;Æ Æ ;: 0 T ( ) Æ ;: ;Æ . ;Æ Æ ;: 0 ;Æ Henc w e can then ;Æ 0 i recusiv i ely , nd the Æ . ;Æ i 0 i i +1 i i +1 Simlary , using (39) 1 tha k k A k + , w e can ensur tha w e can nd Æ pro vide k < 1. 1 2 C Remark 4.15 in The Lema 4.6, main the con w tras er with the decrasing pro as of i of Lema 4.6 increasd. In is the tha pseudo- i stable case consider her, the are increasg with i and for large i enough i the condit < 1 is violated. This is what mak es the i inducto ndig regulait y ther the . As are y action go es pr Lema v 4.16 with Æ the of the norm op er stop for an hig artifc and regulait ator T y the of L on result as ondit (2) more main lines c of not than the The simlar the pro is t. 4. In the this get argumen ertis ery es 5.4, canot this op mak Example one y Section along henc, in wher to of and, se b anlogus pro stop wil predict Contr quite Æ e exampls regulait 4.5 w is pro of ema of 4.6 ~ . This section Lema is 4.16 Lema whose 4.9 T is a c ontr action on . Æ r 0 Again w w e ha v main e e p remak tha erfomd a part al of the op usefl the heuristc idea prelimnay erato is to adjustmen T is ts note tha, in after Section 4.1, the just 1 (41) R [] A Æ A : 1 2 Henc, w of the v e ery exp ect tha simple the op estima for T are simlar to the estima erato 1 ~ ~ 0 kR [] R [ ] 0 k k A k k k 2 C ( X B ( 1 No w, w e pro ced diÆcult diern most to t terms p oin ts whic C dep ( X e terms those end B ( 1 the b h ) 2 estima wil { X 1 in on whic . h F the ful or include op this terms 1 erato ev X ) 2 T . w aluted e at wil ned The t w to o In tha asume ~ in suc h a is w a at y least v arin t Lipsc tha the manifolds 27 hitz. Lipsc This hitz is arnged consta t b is b y c ho osing the ounde. ~ W e note tha if ; 2 ~ , w e ha v e ~ ~ 0 j N ( y ; ( y ) N ( y ; ( y ) j " k k C wher, as b desir b simlar efor, y b w c ho e denot osing b the ounds for y " terms tha adjustmen the ts N ; N in can b Section e made 4.1 as A smal as forti, w e ha v e . 1 2 Simlary j [ A y + B ( y ) + N ( 1 y ; ( y ) N ( 1 ~ [ A y + B y ; ( y )] 2 ~ ( y ) + N ( 1 y ; ~ ( y ) N ( 1 y ; ( y )] j 2 ~ 0 " k k C Finaly , ~ j ( A y + B ( y ) + N ( 1 y ; ( y ) ~ ( A y 1 + B ~ ( y ) + N ( 1 y ; ( y ) j 1 ( A y + B ( y ) + N ( 1 y ; ( y ) 1 ~ ( A y + B ( y ) + N ( 1 y ; ( y ) y ) 1 ~ + ( A y + B ( y ) + N ( 1 y ; ( y ) 1 ~ ~ ( A y + B ~ ( y ) + N ( 1 y ; ( 1 ~ ~ ~ 0 " k 0 k + Lip( ) " k k : C Remark 4.17 ties (12) In to C the obtain pro of tha w the e ha v space e presn ~ ted, get w map ed e only in use to eac the h pro er- other. Nev er- 1 thels, the con tracion part of the argumen t only use tha k A k < 1. 2 It is p osible { but w e wil not cary out the details her { to sho w s tha the op usefl if tions erato T one or w to Remark pro an is ts v a e to smo 4.18 con v tracion on alidte the oth Notice dep C on w e ha v This pro of endc tha . result e ert some n y is someti umerical computa- parmets. establihd uniqes of the xed 1 p oin t in the space ~ under the asumption tha k N k ; k B k are smal. C W in e note tha Section ma this 4.1 y aect Nev the Note can if e arnged b erthls, in tha b v k it arin t A k is y imp scaling manifold and ortan t arbitly 1, the in v cut-o to note tha close arince as to the the equation indcate cut-o orign. (18) can proagte 1 an smal W disturbance. e wil ilustrae The incorp orate This this uniqes condits phenom in claime some her are condits v of is ery diern Example 5.3 obtained gro only t wth from the at int in the condits y of space the ~ whic h w functios e obtained . for 28 R. the stable manifolds whic h w de la er Lla v just e regulait y of the manifolds at the orign. Remark 4.19 A uniqes is v ery w obtained el kno only wn consequ after w of e imp ose a the fact cut-o tha is the tha cen ter 1 manifolds ma y fail to b e C . This comes ab out b ecaus the xed p oin ts r pro duce in a r those of + C space b y carying out In , this whic h section, requis w claimed in Some of a In the t from cut-o. exampls tha canot are b relatd w impro e impro to sho v ed w in exampls tha the certain in v re- directons. [dlL W95], [dlL97 ], e sho w tha the sp ectral gap 5.1 condits (1) ed. 2 Example diern ]. exampl, e t some 3.1 [CFdlL03c rst b are exampls colet exampls ], canot e diern Some Theorm thes [CFdlL03a cut-os k C 5. sult some Consider the map F : 2 R ! R given by: 1 1 2 (42) F ( x ; x ) 1 = x ; 2 x + 1 x : 2 1 2 4 2 Then, the the sp ac map e X do = f ( es x; not 0) j have x 2 any R g C invart manifold tange to . 1 Note tha equalit y the . Al exampl the satie other h yp (1) othesi with of the inequalt y theorm are replacd b y satied. 2 Pr o of. An y C in v arin t manifold can b e tange t to X at the orign 1 can b e writen lo caly as the graph of an functio : X ! X . 1 The functio should satify the equation (17), whic 2 h in our case reads 1 1 2 (43) x = ( x ) 1 + x 1 1 2 T aking deriv ativ es of 4 (43) t wice and ev aluting at the orign, w e obtain: 2 1 1 2 D 2 (0) = D 2 Cleary , this sho ws (0) + 2 4 tha ther is no functio satifyng (43) and 2 h functio. whic has t w o deriv ativ es at the orign. A forti, ther is no C In Remark 5.2 W e note v tha arin t the manifolds 29 main reason wh y Example 5.1 w orks is 2 b ecaus (1 [dlL97 ], = 2) = [ElB01 1 ], condits = 4. Henc, ther [CFdlL03a ] rathe than sp is study a resonac. Inde, sytem ectral tha gap satify 5.3 Consider the Given ar > e 0 , it map admits tange F : intely to the sp e no-resac 2 R ! R many ac ers in 2 whic pa condits. 2 Example the X = exampl C f ( x; . 0) j 5.1 x 2 invart R manifolds g . 1 Pr o of. Again, W e it wil suÆces to recusiv ely pro duce solutin detrmin for the (43) functios . on the in terv als I = i i 1 i [2 ; 2 ] staring with an arbity c hoice on the in terv al I whic 0 has sup ort in the in terio of the in terv h 0 al. P 2 W e wil write ( x ) = ( 1 x ) i + x wher the ha 1 v e sup ort in i 1 i the in terio of I . i Notice tha functio the equation of detrmin, w e in v can arince is nd . i is equiv i alen t suc h tha Inde, if w e w e ha obtain v e the tha (43) +1 to 1 2 (4) ( i x ) +1 = (2 1 x ) i + x 1 1 4 Henc, w e can den b y recusion the . By standr estima, w e i ha v e from (4) 1 2 2 k 2 2 k i 2 k k +1 + 2 : i C ( I ) i C ( I ) +1 i 4 2 This sho ws Example tha the 5.4 seri We c givn onsider the con v ergs uniformly in ( x ; x ) 1 1 F . functio (45) C 1 = x ; 2 x + 1 ( x ) 2 2 1 3 1 wher e identc is al a ly Then, C zer functio with sup ort c ontaie d in (1 ; 2) whic is o. ther e is one and only one invart manifold whic is a log of a b ounde d functio. log but not Pr o of. not 3 = F log 2+ or r evry > 0 , this functio is 3 gr = aph log C 2 C . The equation for in v arince is 1 (46) (1 = 2 x ) = ( x ) 1 + ( x 1 ) 1 3 P i Again, w e write = wher has i i The equations for 2 sup i Z are (47) i ( i +1 x ) 1 = 3 (2 i x ) 1 ort on . (2 i ; 2 +1 ). 30 R. when i 6= 1 de la Lla v e and (48) ( x ) 1 Aplying (47) rep = 3 (2 1 x ) 0 eatdly , w e + ( ( x ha ) n Henc, the 0. only This p can b v e = n 3 (2 1 osiblt e x ) 0 y to arnged w e e c : 1 mak if ) 1 n x 1 ho b ose ounde at = 1 1 is to ha v e . 0 Then, w e are forced, aplying (47) , n ( x ) n = to ha v 1 3 n +1 n +1 e (2 1 x ) 1 1 (49) n = 1 3 (2 x ) 1 : 1 log Unles the is iden ticaly zero, w e se tha (49) is not 3 = log 2+ C . Note tha w Example e 5.4 can run run in the the argumen op t osite in the pro directon. of of That the is, staemn w e ts can tha log the only in a w a neigh y b to obtain orh o a d of functio the satifyng orign is (46) to ha v e whic 0 h is whic in argue 3 = log 2+ C h . in turns forces 1 exp one tial gro Henc, wth at Example ditons 5.4 in Unles Remark W e 4.1, zero, ma linear cut manifolds pro Note o map the are t so the map the o to uniqes sp eak fail. Section ounde in space. in to in b linear orthgnal. goin indcate course, preations con- is as Of just w other (45) map. the the are, satied linear case, h 4.18 is the pseudo-tabl This Section v sho 4.1 arin t ws do tha, aect the duce. also the e whic Remark them w just the in in of if . exampl and obtain for the an one tha y manifolds in is if note e y 4.1 is also w int tha manifold in is Example more 5.4, regula w than e ha the v e the phenom crital tha regulait y log 3 = once log 2 then 1 it is C W . e also note tha in the case of the linear map, log itely man y in v arin t manifolds x = A j x 2 Henc uniqes do es not W m e do not ulation form for [CFdlL03a ev ulate Resul en in ts f precisly diern v log w e ha v e 2 in- log whic the or h crital flo the tiable = are 3 = log . regulait for elds . ws result ector y is o quite ws since the standr. for- Se e.g ]. In 6.1, w 3.1 when Section for maps e ha v w e imply some e wil presn t uniqes a result result for v rigous argumen for ector 2 C 1 hold 6. 3 j elds. the t maps, the tha sho result ws Theorm tha, In The v main result eris the under tha, t map manifolds 31 vide of time-1 arin pro asumption the o is v tha the Theorm pro 3.1, duce b y time-1 map the, the Theorm of the manifold 3.1 is o in in v arin t v w arin t under the w. Ev en for if o to the ws p b oin 6.2 t w the e argumen y in Section them tha it presn is t result p an for easily t reducing ws. h W { e e rigous a it for of read of think of pro the e pro rigous tha pro w out a a maps, cary not hop es for to etc giv result osible sk o 6.1 to o { e tersing In a b result in ws. of wil of is Section direct pro able to of l of details . 6.1 Deducing Giv result en a o w f S for g ws genrat t the o t asumption 2 b from y a Theorm smo oth 3.1 v ector eld for Y , w maps. e note tha R of Theorm 3.1 can b e satied for al the maps S . t W e furthemo ha v e tha D S (0) = exp ( tD Y (0). Henc, if D Y (0) has t an in v arin t decomp ositn so do es D S (0). W e wil denot D Y (0) = A t and denot the W e also decomp note ositn tha as the result in (14) in . Section 4.1 can b e easily adpte for r o ws. Namely , b y scaling w e can ensur tha j D S ( ) exp ( tA ) j t C ( X ) 1 is as smal as In the desir v B ( 1 a If e [0 ; eld ) and w to tha 1]. e can pro ensur ced tha therfo as the w e v can in ector a Section 4.1 eld den S is in 2 w w ector X 2 h 2 case, the suc t pseudo-tabl cut-o X for X tha it aply is close to Theorm 3.1 to ounde t y b in B ( 1 X ) 1 in 2 linear. to eac h of the maps S w e obtain an in v arin t t manifold. The manifolds only are W e thing the note tha same tha w for since al S Æ S , then so is S w can v e to w diern = ory ab t S Æ s M t If ha the S t under e S , s v if out alues a is of t whetr thes . manifold M is in v arin t t . s e ha v e some conlude uniqes tha staemn S M = M t . That is for in M v is in arin v t manifolds, arin t w for the whole s o w. In if the stable M is case, tange the t at uniqes the staemn orign to X t , then, tha w cleary e can so use is S 1 S M is also as regula as M , is M . tha Since, s then, the conlusi of Remark 4.1 s alo w In us to conlude the the desir pseudo-tabl graph of result. case, a functio : the X ! observ ation X 2, whic is h is tha since M uniformly b is the ounde and 1 S diers from exp sA b y a map of smal Lipsc hitz consta t, w e obtain, s therfo tha S M is also a graph. s Using S M s = the M . uniqes staemn ts in Remark 4.18, w e obtain tha e 32 R. Of course, used for diern Nev eac t w y b e e p oin t b diern 6.1 es not only An use use v ery etc w e erfctly w sho logica, wn in t e of ha v Example 5.4, uniqes e course. the argumen ts ation y the ector v argumen v t W e tiable. tial tin course e tiable. Diern discon of o diern diern artil henc is, is is P ab X eld in { This the eld en ounde ws. tha ector v hap b is v equations uos ery { w el op eratos kno wn for a direct a pro of. rigous pro Ev tiong tha of one en for if o can the ws also argumen from t giv the e a presn ted result direct for pro of in maps, of it the result ws. The metho metho d d. pro b p diern the un o a es men o case is [Sho97]. of giv orth for pseudo-tabl the observ this has oth e.g h t b one se 6.1 is the wil of tha genratd smo { Section e This as h fact of ery time Sk tha, exampls often v 6.2 or eac ortan the w t genrat long al o ortan wher v ts. the imp at the Imp stable out y Lla t. Remark do the la staemn selctd ma of uniqes erthls manifolds h de F of. or Ev presn ofs W e the t of y b the usal P w not e b usefl ws e for than the a in presn t pro reads the tial e eron's complet the with diern one of completns, wil o write arin e this for comp v sak if ma pro a the en taion the is ofs equations w are for equation sk of, who pro an tegral etc h e of hop a e more direct tha this familr with dieomrphs. genrati the o w separting ts. x _ = A x 1 + 1 B x + 1 N ( 2 x ; 1 x ); 1 2 (50) x _ = A x 2 As it is graph standr, is F or in w v the arin diern t, sak e of tiable, with smo oth if the ; w ); 2 an tha , x 1 e w sem only x deriv sho it ( 2 rst wil y en equation for the e asume the some of the aproite v gro whose a tha tha functio has tha (satifyng a equation wil clear asumption semigroup detail wil e N 2 simplct ev throug e w + 2 the v solutin. ector eld result ector w eld wth is ould go genrats a condits, whic h w later). e W e note tha if w e ha v e x = ( x ) 2 x _ = A x 1 + 1 w e ha v e 1 B ( x ) 1 + N ( 1 x 1 ; ( x ); 1 1 (51) _ ( x ) = A 1 W x . e If note tha, is if Lipsc ( x w 2 e hitz, x w e , se ) + N ( 1 x 2 the rst tha the ; ( x 1 ); 1 equation b rst ecoms equation an of ODE (51) wil for ha v uniqe 1 solutin. W e denot the condits x b y ( 1 x ). 1 t solutin of this equation with intal e a In W e ha v e v arin t manifolds 3 tha A t "t 1 j ( x ) j k e k e t 0 1 t wher " men is ts a in The n of b W e b er h to the y use P pro arbitly e of smal smal is the same d ariton of if w e c ho ose the arnge- enough. metho v and is b eron's the (51) whic 4.1 idea manifold of um Section as (se the standr e.g pro [Hal80 parmets ] form Ch. of VI ula in of I the the p. stable 25 . second ). equation obtain Z t A t A ( 2 (52) ( ( x ) = t s ) 2 e ( x ) 1 + ds e N ( 1 ( x ) 2 ; ( ( x ) 1 t 1 s s 0 Equiv alen tly , Z t A t sA 2 (53) 2 e ( ( x ) = ( x ) 1 + ds e N ( 1 ( x ) 2 ; ( ( x ) 1 t 1 s s 0 In the stable case, w e note tha, if w e consider functios whic h are 2 C and satify (0) = A 0, D t (0) = 0, w e ha v A (54) j e t 2 A t 2 e ( ( x ) j C k "t 2 1 e k ( k e k e ) 1 t The condit A t A t 2 (5) k for some cleary > an 0, Under es of to as t k e RHS k of (5), ! graph ( 1 of . 2 e ) (5) C t go e es to zero exp one tialy , is, (1). asumption 0 the k the of this go tha anlogue "t 1 e w Henc, w e e obtain tha obtain the tha a rst term condit in for in v (53) arince is Z 1 sA 2 (56) ( x ) = ds e N ( 1 ( x ) 2 ; ( ( x ) 1 1 s s 0 Note also tha (5) and the quadrtic v anishg of N , at the orign 2 also imply tha Henc, the w den b A y e tegral in consider the usefl in wil the (56) RHS as a of xed (56) p con oin t v ergs uniformly equation for . the op erato RHS. heuristc guide is tha this op erato is v ery simlar to Z 1 sA A s 2 ds A s 1 e N ( 1 e ( x ) 2 ; ( e x ) 1 1 0 Again, if ator w e tak obtained has a b the T o norm sho conial e w whic tha space y with comp h osing is the norm w b y T more norms, the b erato ws ted on ounde op fol eigh righ the t les a obtain con the e line op er- functio tracion. when same the traciv con tracion the tha a of con e with square is or w of top argumen olgized t b than y 34 R. in the case til w of e get dieomrphs, to The pro de Lla v e namely the of la heuristc of ading and subtracing terms princle. o ws is sligh tly more compliated than in the case of A s 1 dieomrphs since w e ha v e to obtain estima for ( x ) e x . 1 1 s Of course, thes tions of can ODE's anlogues for W in to m ulas e, of obtained from the but they dep tak endc e on longer to the solu- write than the dieomrphs. also es for ha but the v e the hig deriv to sho pro w of deriv ativ The e parmets, course, themslv higer b on tha is ativ the op extrmly es erato maps simlar of the op the once erato w T whic e h space obtain for- separt the es. pseudo-tabl case is in man y w a ys easir. In this case, w e canot asume tha is a con tracion, so w e ned to mak e sure tha s the functios ha v e domain in al of X and, therfo tha the N are 1 smo oth in al of X B ( 1 X ). 1 This is done in Section 4.1 2 sA 2 Since w e are asuming tha e is a con tracion for large s , ther is 0 no problem sho Also, using sho w wing tha the tha the same the a w ork space Dean's of m felo y at Seminar, out v ab ery the in en to con tracion in ativ es, themslv it C is p norm. osible to es. sup of T orted exas F al 20, the made a gran W v v b studen ts alube y of comen to reading and Dynamicl also careful ts orking ery Thanks and NSF The in materil. y Austin. ts this discuon b at particn exas of tenig b the taion a deriv wledgmnts Univ. U.T presn enligh ckno and is hig ed has course System A (56) the map author wship gradute for get the of ulas 7. The RHS form of E. F the ts on pa tic h for er. Refrncs [CFdlL03a] Xa vier Cabr terizaon e, Ernest F metho no-resa d t MP AR [CFdlL03b] Xa C vier tic in v subpace. h, and arin Rafel t Ind. de manifolds la I: Univ. Math. Lla v e. The manifolds parme- aso Jour , ciated to 52():83{, 203. #02-51. Cabr terizaon e, Ernest F metho to on for d parmets. for on Ind. in tic v h, and arin Rafel Univ. t de manifolds Math. I Jour , la I: Lla v e. The regulait parme- y 52():39{60, with resp 203. MP ect AR C #02-51. [CFdlL03c] Xa vier Cabr izaton metho In pr [DGZ93] ep ert r Rob enormigs e, Ernest F ar d ation for , in on tic h, arin t and Rafel de manifolds la I: o Lla v erviw v e. The and parmet- aplictons. 203. Devil, Giles in v Banch Go defro sp ac y es , v , and olume V acl 64 v of Zizler. Pitman Smo Mon othnes and gr aphs and In Surveys in nical, [dlL97] e w, Rafel de tral [dlL Pur Harlo la Lla de la Mohamed 7, Mathemics arin . t v manifolds Longma Scien aso Phys. e and , C. . ciated tic & T ec h- W a Math. yne. On Z. Sub-stale and sp noresa t sp ec- 197. Eugen t to 87(1-2):{49, theorm. no-resa k K. Hale. lishng Or Co. [HP70] W. b olic dinary Inc., Moris w ectral , Irwin's pro of 219():30{, of the 195. eak-stbl manifolds subpace. h In ential tingo, e N.Y, and Glob aso Math. A C. nalysi 1968) Z. . pages Rob ert , ciated 236(4):71{ c. Pub- manifolds Symp os. 13{6. Krieg 1980. Stable o E. editon, Pugh. (Pr , quations second Charles al Calif., R.I, dier Hun Hirsc set. Berkly, and Pur Amer. e h Math., V Math. So c., yp ol. er- Pro XIV, videnc, 1970. [HPS7] M.W Hirsc V h, erlag, [Irw80] C. [JPdlL95] new Math. M. Y c. a. B. termdia P osi , Kato. Oscar and Da ork of vid 159{2, E. theorm. Lla v e. On the in dieomrphs. for J. tegrabil y Er line T ak c op e p ens. erio In dings a ar go dic of The Clasic ory in the 1980 in to in Daniel pr in t Physic al instue Notes arin Joseph, the sumer Lectur v D. oblems le Math- editon. solutin Stakgold, Batel erlag. . of dic Iv ar of Springe-V ators t Nonlie e er Reprin editors, o 1973. ar 195. of Pr I. In sytem. Houches, In 198) Da vid . R. , Ruel. ory Sho w , in pages Mathemics, Sh Y ub. 1987. Langevi, T a es : lave@mth.ux dier entiabl er . dy- (L es 1983. dynamics MA, quations of sytem Amsterda, op Glob ork, Texas theory detrminsc and bifur c ation the- 198. ators in Banch American sp ac e and Mathemicl nolie So ciet ar y , Pro vi- 197. hael New matheicl of Bostn, Monte e the ehavior North-Hland, of ential RI, Mic to 3{51. Inc., alter. dier denc, duction b pages Pres E. tro Chaotic Elemnts Academi artil u87] la v Bifurcaton gy: Lanford namicl p Springe- 583. 32. Oscar [Sho97] ol. manifold de ory and biol Berlin, ol. [Rue89] R. Berlin, Satinger, and . V 195. Ruel H. es manifolds pseudotabl Anos the I. w Scien [LI83] and ation Lanford the Invarit Mathemics, 1980. erlag, E. tori: the 15(2):37{, Springe-V V of esin, Pertub ematics. [LI73] of for System T ub. in 21:57{6, distrbuon Dynam. [Kat95] , Sh Notes pro So Jiang, in M. Lectur A ond and 197. Irwin. L Pugh, Berlin, M.C adr 35 201. Jac of v ElBiay nitely [Hal80] E-mail In Stais. Lla S. with manifolds d manifold [ElB01] Univ. e. J. Rafel t Aplie v pseudotabl [Sh and arin 193. subpace. W95] v t al stabily of With ranslted the from A ustin A dynamic al colab the oratin ustin, F TX s. edu renc h 7812-0, sytem of b y . Alb Joseph ert U.SA Christ Springe-V F erlag, athi y and . R emi