Robert Recorde  

Robert Recorde (1510–1558)


Born  c. 1510 Tenby, Pembrokeshire, Wales 
Died  1558 London, England 
Nationality  Welsh 
Fields  Mathematician and physician 
Institutions  University of Oxford Royal Mint 
Alma mater  University of Oxford University of Cambridge 
Known for  Inventing the "equals" sign (=) 
Robert Recorde (c. 1510 – 1558) was a Welsh physician and mathematician. He introduced the "equals" sign (=) in 1557.
A member of a respectable family of Tenby, Wales, he entered the University of Oxford in about 1525, and was elected a fellow of All Souls College 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.^{[1]} After being sued for defamation by a political enemy, he was arrested for debt and died in the King's Bench Prison, Southwark, in 1558.
Recorde published several works upon mathematical subjects, chiefly in the form of dialogue between master and scholar, such as the following:
Sherburne states that Recorde also published Cosmographiae isagoge, and that he wrote a book De Arte faciendi Horologium and another De Usu Globorum et de Statu temporum. Recorde's chief contributions to the progress of algebra were in the way of systematizing its notation.
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