Rahn

Johann Heinrich Rahn

Born: 10 March 1622 in Zurich, Switzerland
Died: 1676

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Rahn was the first to use the symbol Ö for division in his algebra book published in 1659. Pell helped Rahn with this book which contains an example of Pell's equation.

References elsewhere in this archive:

Tell me about Pell's equation 

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JOC/EFR February 1996