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When did mathematicians begin to use the letter x to denote unknown values ? Gérard Lang

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When did mathematicians begin to use the letter x to denote unknown values ? Gérard Lang

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documenteduse, it goes back to Descartes, who simultaneously introduced y and z (and a,b,c) to denote unknowns. (pages 380-383 in Cajori's book) $\endgroup$ – Gjergji Zaimi Oct 14 '15 at 9:06