By Collins KS3
By Jamie James
By David Alcorn
By Suman Singha (University of Connecticut, Storrs, CT, USA), Tara Baugher
By Isaacs, Alan, Daintith, John, Martin, Elizabeth
By Carl B. Boyer, Uta C. Merzbach
By David Smart
By SQA
By David Bodanis
By Rosemary Emanuel, John Wood
By Mark Rowland
By School Mathematics Project
By James M. Brown, Andy Martin, Paul Rigby, Simon Riley
By Natasha Maurits, Branislava Curcic-Blake
By Michael J. Crawley (Imperial College of Science, Technology and Medicine, UK)
By Theoni Pappas
By Rayner, David
By Ian Bloomfield, John Stevens
By B.D. Bunday, H. Mulholland
By Malcolm Pemberton
By CGP Books
By Prof. Alan Smith, Sophie Goldie
By M. Garcia-Sancho
By Ric Pimentel, Terry Wall
By Raymond Barnett, Michael Ziegler, Karl Byleen, David Sobecki
By Gilbert Strang (Massachusetts Institute of Technology)