Frances Hardcastle (13 August 1866 – 26 December 1941) was an English mathematician, in 1894 one of the founding members of the American Mathematical Society.
[4] Born in Writtle, just outside Chelmsford, Essex,[4][5] Hardcastle was a daughter of Henry Hardcastle, a barrister,[6] by his marriage in 1865 to Maria Sophia Herschel,[7] daughter of the astronomer, mathematician, and chemist Sir John Herschel.
While at Bryn Mawr she was president of the Graduate Club and translated Felix Klein's book On Riemann's Theory of Algebraic functions and Integrals.
[10] Hardcastle was the lifelong companion of Dr Ethel Williams, a physician, Justice of the Peace, feminist, and social reformer.
[11] She died at the Royal Hotel, Cambridge, on 26 December 1941, when her home address was stated as Low Bridges, Stocksfield, Northumberland, and left a substantial estate valued at £4,400.