By Paul Metcalf
By Christopher Green
By John Berry
By Graham E. Berry, A.J.P. Watkins, E. Graham
By Brian Bolt
By Theoni Pappas
By Judita Cofman (Professor, Mathematics Institute, Professor, University of Erlangen)
By Anton Deitmar
By Agusti Reventos Tarrida
By Jean-Baptiste Hiriart-Urruty
By Franco Vivaldi
By Roozbeh Hazrat
By Rene Schoof
By Daniel Grieser
By Flo Conway, Jim Siegelman
By David Millar, margaret millar, D. Millar, J. Millar
By Charles Coulston Gillispie
By Bryan H. Bunch
By Darren Redfern
By Keith J. Devlin
By Alexander Masters
By Paul J. Nahin
By Ioan James (University of Oxford)
By Tony Bridgeman, Gordon Ramsey Baldock
By Amir D. Azcel
By Professor Ian Stewart
By John O. Bird, A. J. C. May
By J.R. Irwin
By C.W. CELIA, etc., A. T. F. Nice, K. F. Elliott