William Jones (mathematician)

William Jones
William Jones
	Portrait of William Jones by William Hogarth, 1740 National Portrait Gallery
Born	1675; Llanfihangel Tre'r Beirdd,; Isle of Anglesey
Died	3 July 1749 (aged 73–74); London, England
Children	Sir William Jones

William Jones, FRS (1675 – 1 July 1749^[1]) was a Welsh mathematician best known for his use of the symbol $π$ (the Greek letter Pi) to represent the ratio of the circumference of a circle to its diameter. He was a close friend of Sir Isaac Newton and Sir Edmund Halley. In November 1711, Jones became a fellow of the Royal Society,^[2] and later served as the Royal Society's vice-president.^[3]

^ Roberts, Gareth Ffowc (2020). Cyfri'n Cewri. University Press Wales. p. 57. ISBN 978-1786835949.
^ "William Jones 1675 - 1749". People. Royal Society. Retrieved 29 March 2025.
^ Cite error: The named reference rothman was invoked but never defined (see the help page).

William Jones
Portrait of William Jones by William Hogarth, 1740 National Portrait Gallery
Born	1675 Llanfihangel Tre'r Beirdd, Isle of Anglesey
Died	3 July 1749 (aged 73–74) London, England
Children	Sir William Jones