Mathematician and physician, inventor of the equals sign
Robert Recorde (c.1510 – June 1558) was a Welsh physician and mathematician, born in Tenby, Pembrokeshire. He is credited with introducing the equals sign (=) to English mathematics and is regarded as a founding figure of modern algebra in Britain.
Recorde was educated at the University of Oxford, graduating around 1531, and later took a medical degree at Cambridge in 1545. He wrote a series of influential mathematics textbooks in English rather than Latin, making the subject accessible to a much wider readership. His 1557 book 'The Whetstone of Witte' introduced the equals sign, explaining that he chose two parallel lines 'bicause noe.2.thynges, can be moare equalle'. It also popularised the plus (+) and minus (−) symbols among English speakers.
He achieved high office, serving as physician to both Edward VI and Mary I, and later as Comptroller of the Royal Mint. His prominence brought him powerful enemies, and he was eventually ruined by a lawsuit. Robert Recorde died in June 1558 while imprisoned for debt at the King's Bench prison in Southwark, London.
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Mathematician who invented the equals sign and helped found English-language algebra.
Robert Recorde
Mathematician and physician, inventor of the equals sign
Born in Tenby, Pembrokeshire
Recorde also served as Comptroller of the Royal Mint, and his high public profile ultimately contributed to his downfall through a damaging lawsuit. Despite dying in debtors' prison, his textbooks — including 'The Grounde of Artes' and 'The Whetstone of Witte' — remained influential in English mathematics teaching for generations after his death.
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Career Highlights
Born: c.1510, Tenby, Pembrokeshire
Known for: Inventing the equals sign (=)
Category: Scientists / Mathematics
ℹ️ Robert was born around 1510 in Tenby, Pembrokeshire, Wales.
ℹ️ Robert died in June, 1558.
Born in Tenby, Pembrokeshire
From: ZeroHour
Born in Tenby in 1510. Apart from designing the equals sign, he was the founder of modern Algebra. He was also later physician to Edward VI. Later still he was the head of the Mint in Bristol. However he fell on hard times and died in a debtor's prison in 1558.
From: gordie168
Reprints of Robert Recorde Books: Robert Recorde's 16th century mathematical books are back in print after 450 years. Full specifications of his books, sample 'look-inside' pages, isbn and prices etc. are all on the site.