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with Rahn in this book, which contains an example of the Pell equation. It is uncertain whether Rahn or Pell was responsible for introducing the symbols.

Biography

Rahn was born in Töss, in the canton of Zurich, on 10 March 1622, the son of Ursula Escher vom Glas and Hans Heinrich Rahn, Amtmann of Töss and future mayor of Zurich.

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