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John Wallis
John Wallis by Sir Godfrey Kneller, Bt.jpg
Born 3 December [O.S. 23 November] 1616
Ashford, Kent, England
Died 8 November 1703(1703-11-08) (aged 86) [O.S. 28 October 1703]
Nationality English
Education Felsted School, Emmanuel College, Cambridge
Known for Wallis product
Inventing the symbol
Extending Cavalieri's quadrature formula
Coining the term "momentum"
Scientific career
Fields Mathematics
Institutions
Academic advisors William Oughtred
Notable students William Brouncker

John Wallis ( Latin: Wallisius; 3 December [O.S. 23 November] 1616 – 8 November [O.S. 28 October] 1703) was an English clergyman and mathematician who is given partial credit for the development of infinitesimal calculus. Between 1643 and 1689 he served as chief cryptographer for Parliament and, later, the royal court. He is credited with introducing the symbol ∞ to represent the concept of infinity. He similarly used 1/∞ for an infinitesimal. John Wallis was a contemporary of Newton and one of the greatest intellectuals of the early renaissance of mathematics.

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