English mathematician credited with the invention of the slide rule.
Experimented with notations in his famously compact writings, inventing some new symbology which stuck, notably $\times$, $\sin$ and $\cos$.
Among others, he may have been influential in the introduction of the symbol $\pi$ for pi, using an abbreviation for the Greek word for periphery (that is, περιφέρεια).
- Born: 5 March 1574, Eton, Buckinghamshire, England
- Died: 30 June 1660, Albury, Surrey, England
- 1631: Clavis Mathematicae
- 1632: Circles of Proportion and the Horizontal Instrument
- 1657: Trigonometrie
- John J. O'Connor and Edmund F. Robertson: "William Oughtred": MacTutor History of Mathematics archive
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): A List of Mathematicians in Chronological Sequence
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): A List of Mathematicians in Chronological Sequence
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Entry: Oughtred, William (1575-1660)
- but beware of the mistake in the year of birth