"Descartes devised the notation x, x2, x3, x4,... for powers, and made the final break with the Greek tradition of admitting only the first, second, and third powers ('lengths,' 'areas,' and 'volumes') in geometry. After Descartes, geometers freely used powers higher than the third without a qualm, recognizing that representability as figures in Euclidean space for all of the terms in an equation is irrelevant to the geometrical interpretation of the analysis. The principle of undetermined coefficients was also stated by Descartes. A second outstanding addition to algebra was the famous rule of signs... the first universally applicable criterion for the nature of the roots of an algebraic equation. ...it admirably represents Descartes' flair for generality which made him the mathematician that he was."
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Natural philosophersCatholics from FrancePhilosophers from FranceMathematicians from FrancePhysicists from France
Original Language: English
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Eric Temple Bell, The Development of Mathematics (1940)
https://en.wikiquote.org/wiki/Ren%C3%A9_Descartes
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René Descartes
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