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By Seiter
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By Dowling, Edward
By Lindley, D. V., Miller, J. C. P.
By Caroline Fawcus, Peter Clarke
By William E. Boyce, Richard C. DiPrima
By Poskitt, Kjartan, Reeve, Philip
By John A. Deft
By Collins KS2
By Mark Patmore
By Holland, D.A., Soper, S. A., D.A. Holland, S. A. Soper
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By Princeton Review
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By The Math Forum, Jessica Wolk-Stanley
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By Frank Ayres, Elliott Mendelson
By Rumsey, Deborah J., Deborah J. Rumsey
By Barnes, Simon, Simon Barnes
By Linzi Henry
By Collins GCSE
By Estela A. Gavosto (University of Kansas), Steven G. Krantz (Washington University, St Louis), William McCallum (University of Arizona)
By W.W.Rouse Ball
By Eugenia Cheng
By Mike Ollerton
By A. J. Sadler, D. W. S. Thorning
By Surinder Virdi (South and City College Birmingham, UK), Roy Baker (formerly of City of Wolverhampton College