John Arthur Todd FRS[1] (23 August 1908 – 22 December 1994) was an English mathematician who specialised in geometry.
He was born in Liverpool, and went up to Trinity College, Cambridge in 1925.
[3] The Todd class in the theory of the higher-dimensional Riemann–Roch theorem is an example of a characteristic class (or, more accurately, a reciprocal of one) that was discovered by Todd in work published in 1937.
The Todd–Coxeter process for coset enumeration is a major method of computational algebra, and dates from a collaboration with H.S.M.
In 1954 he and G. C. Shephard classified the finite complex reflection groups.