By Robert Lomax
By AIIA, Times Mind Games
By William Byers
By Gould
By Gould, Wayne
By Marcus Du Sautoy
By Unknown, Various
By William Bolton (Formerly Lecturer, Buckingham Chilterns University College, High Wycombe, UK)
By Mazur, Joseph
By Bais, Sander
By BOWERMAN, Bruce L., O'Connell, Richard T.
By The Times Mind Games
By The UK Mathematics Trust
By L. Susan Stebbing, C. W. K. Mumble
By Chartrand, Gary, Polimeni, Albert D., Zhang, Ping
By Rotman, Brian
By Tubbs, Robert, Jenkins, Alice, Engelhardt, Nina
By Mary Ann Caws
By Mankiewicz, Richard
By Gersting, Judith L.
By Hunter, Geoffrey
By Dunham, WILLIAM
By Burger, Edward B., Starbird, Michael
By Chaitin, Gregory J.
By Sfard, Anna
By Benacerraf, Paul
By Lave
By Lakatos/Worrall/Zahar
By Karin Erdmann, Thorsten Holm