Robert Recorde


Robert Recorde was a Welsh physician and mathematician. He invented the equals sign and also introduced the pre-existing plus sign to English speakers in 1557.

Biography

Born around 1512, Robert Recorde was the second son of Thomas and Rose Recorde of Tenby, Pembrokeshire, in Wales.
Recorde attended Greenhill grammar school
Recorde entered the University of Oxford about 1525, and was elected a Fellow of All Souls College there in 1531. Having adopted medicine as a profession, he went to the University of Cambridge to take the degree of M.D. in 1545. He afterwards returned to Oxford, where he publicly taught mathematics, as he had done prior to going to Cambridge. It appears that he afterwards went to London, and acted as physician to King Edward VI and to Queen Mary, to whom some of his books are dedicated. He was also controller of the Royal Mint and served as "Comptroller of Mines and Monies" in Ireland. After being sued for defamation by a political enemy, he was arrested for debt and died in the King's Bench Prison, Southwark, by the middle of June 1558.

Publications

Recorde published several works upon mathematical and medical subjects, chiefly in the form of dialogue between master and scholar, such as the following:
Several books whose authors are unknown have been attributed to him: Cosmographiae isagoge, De Arte faciendi Horologium and De Usu Globorum et de Statu temporum.