# Document 10834468

```Hindawi Publishing Corporation
Volume 2011, Article ID 272703, 1 page
doi:10.1155/2011/272703
Erratum
Erratum to “The Partial Inner Product Space
Method: A Quick Overview”
Jean-Pierre Antoine1 and Camillo Trapani2
1
Institut de Recherche en Mathématique et Physique, Université Catholique de Louvain,
1348 Louvain-la-Neuve, Belgium
2
Dipartimento di Matematica ed Applicazioni, Università di Palermo, 90123, Italy
Correspondence should be addressed to Jean-Pierre Antoine, jean-pierre.antoine@uclouvain.be
Received 27 February 2011; Accepted 13 March 2011
reproduction in any medium, provided the original work is properly cited.
The definition of homomorphism given in Section 5.2.2 is incorrect. Here is the exact
definition. The rest of the discussion is correct.
Let VI , YK be two LHSs or LBSs. An operator A ∈ OpVI , YK is called a homomorphism
if
i for every r ∈ I, there exists u ∈ K such that both Aur and Aur exist;
ii for every u ∈ K, there exists r ∈ I such that both Aur and Aur exist.
Equivalently, for every r ∈ I, there exists u ∈ K such that r, u ∈ jA and r, u ∈
jA, and for every u ∈ K, there exists r ∈ I with the same property.
The definition may be rephrased as follows: A : VI → YK is a homomorphism if
pr1 A ∩ A I,
pr2 A ∩ A K,
1
where A {r, u : r, u ∈ A} and pr1 , pr2 denote the projection on the first, respectively,
the second component.
Contrary to what is stated in 1, Definition 3.3.4, the condition 1, which is the correct
one, does not imply A I &times; K and A&times; K &times; I.
We denote by HomVI , YK the set of all homomorphisms from VI into YK . The
following property is easy to prove:
Let A ∈ HomVI , YK . Then, f#I g implies Af#K Ag.
References
1 J.-P. Antoine and C. Trapani, Partial Inner Product Spaces—Theory and Applications, vol. 1986 of Springer
Lecture Notes in Mathematics, Springer, Berlin, Germany, 2010.
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