Archibald Read RichardsonArchibald Read Richardson FRS was a British mathematician known for his work in algebra.CareerRichardson collaborated with Dudley E. Littlewood on invariants and group representation theory. They introduced the immanant of a matrix, studied Schur functions and developed the Littlewood–Richardson rule for their multiplication.Awards and honoursRichardson was elected a Fellow of the Royal Society on 21 March 1946.