The Mathematical Gazette CONTENTS Articles The Hypercubical Dance P. K. Aravind 193 The Hindu method for completing the square Dave L. Renfro 198 Hagge Circles and isogonal conjugation C.J. Bradley and G.C. Smith 202 Groups of rational functions K. Robin McLean 208 Trigonometry and Fibonacci numbers Barry Lewis 216 Differential equations R.V.W. Murphy 235 Jim Farmer 246 Diophantine equations and Farey means Paul Stephenson 249 Fibonacci meets Chebyshev Alan F. Beardon 251 Maths bite: an unusual proof that √N is irrational Nick Lord 256 Matter for Debate Misconceptions of randomness and expected sequential pairs in a permutation of integers Notes 91.29 to 91.57 Some more irrational thoughts Nick Lord 256 Fermat's last Theorem in the case n = 3 Roy Barbara 260 Positive solution of Mordell's equation Des MacHale 262 Extrema of a symmetric function Michael D. Hirschhorn 264 Functional equations and groups Alan F. Beardon 267 Folding graphs: a rich source of calculus examples Nick Lord 270 A geometric characterisation of the power functions Timothy G. Feeman & Osvaldo Marrero 275 Generalising an examination problem on maximisation Nick Lord 279 An amusing sequence of trigonometrical integrals Nick Lord 281 Some integrals involving ln (tan t) Francis Woodhouse 285 Pseudo-convergants Martin Griffiths 290 A furniture removal problem Anthony C. Robin 297 Dove-tail sequences Martin Griffiths 300 The fundamental theorem of algebra deduced from elementary calculus Jose Carlos Santos 302 Integrals - indefinite or misdefined? Douglas Quadling 303 Newton-Raphson revisited David Elgin 307 A geometrical recreation or how to avoid your neighbours Stuart Simons 312 Mirror magic squares from Latin squares Hossein Behforooz 316 A generalization of Feynman's triangle Robert J. Clarke 321 Heron triangles with ےb = 2ےA Douglas W. Mitchell 326 Similarity properties of the Bride's Chair Nick Lord 328 Maths bite: the 'perpendicular-parallel' axes theorem Nick Lord 331 Did Kepler know this? Mark Blyth 332 Linearly-resisted trajectories and the over-under theorem Sean M. Stewart 335 Re-estimating bounds on athletic performance Michael A. B. Deakin 338 Modelling penalty competitions to decide football matches Jon Warwick 342 Feedback 349 Correspondence 356 Problem Corner Nick Lord 358 Student Problems Tim Cross 366 Reviews 371 Acknowledgements 384 The Mathematical Association 2007