Mathematician:Johann Heinrich Rahn
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Swiss mathematician credited with the first use of the division symbol, $\div$, also known as the obelus, and the therefore sign, $\therefore$.
- Born: 10 March 1622 in Töss, Switzerland
- Died: 25 May 1676 in Zürich, Switzerland
- 1659: Teutsche Algebra (technically a collaboration with John Pell)
Also known as
The Latinised form of his name was Rhonius.