Claude-Gaspar Bachet de Méziriac

French mathematician

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contribution to mathematical recreation

Lagrange’s four-square theorem

  • Joseph-Louis Lagrange, engraving by Robert Hart
    In Lagrange’s four-square theorem

    …number theory was the Frenchman Claude-Gaspar Bachet de Méziriac, whose Latin translation Diophanti (1621) of Arithmetica brought the work to a wider audience. In addition to the proof of Diophantus’s four-square theorem, study of the text led to a generalization of the theorem known as Waring’s problem.

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