The book of numbers /

by Conway, John Horton 1937-2020, Conway, John Horton 1937-2020
Published 1996

On quaternions and octonions : their geometry, arithmetic, and symmetry /

by Conway, John Horton 1937-2020
Published 2003

Winning ways for your mathematical plays /

by Berlekamp, Elwyn R., Berlekamp, Elwyn R., Conway, John Horton 1937-2020, Guy, Richard K.
Published 1982

How to solve it : a new aspect of mathematical method /

by Polya, George 1887-1985, Polya, George 1887-1985
Published 2004