Diary (August 23, 2020)

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Online diary of Karl Jones for Sunday August 23, 2020.

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Diary

August 23, 1638

René Descartes, in a letter to Marin Mersenne, proposed his folium (x-cubed + y-cubed = 2axy) as a test case to challenge Pierre de Fermat's differentiation techniques. To Descartes' embarrassment, Fermat's method worked.

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