When1: 1629
When2: 1640
Who: Pierre de Fermat [Fermat, Pierre de]
What: mathematician
Where: France
Detail: He lived 1601 to 1665, invented Fermat's minor theorem and Fermat's last theorem [1640], and studied differential calculus, maxima/minima in war and astronomy [1629], curve and surface tangents and normals in optics and motion, and infinite-descent method.
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Date Modified: 2022.0224