On this day in 1638, René Descartes, in a letter to Mersenne, proposed his folium ($x^3+y^3=2axy$) as a test case to challenge Fermat's differentiation techniques. To Descartes' embarrassment, Fermat's method worked better than his own.
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Born:
1683: Giovanni Poleni Ⓟ
1778: Jozéf Hoëné Wronski Ⓟ
1797: Jean Claude Saint-Venant Ⓟ
1829: Moritz Cantor Ⓟ
1842: Osborne Reynolds Ⓟ
1873: Zoárd Geöcze Ⓟ
1893: Joseph Ritt Ⓟ
1909: Florence Nightingale David Ⓟ
1919: Vladimir Abramovich Rokhlin Ⓟ
1928: Israel Gohberg Ⓟ
1929: Anthony Spencer Ⓟ
1956: Andreas Floer Ⓟ
Died:
1806: Charles Augustin Coulomb Ⓟ
1923: Hertha Marks Ayrton Ⓟ
1935: Julius Gysel Ⓟ
1973: Hellmuth Kneser Ⓟ
2004: Leopold Schmetterer Ⓟ
2006: Elemér Kiss Ⓟ
2009: Pierre Samuel Ⓟ
2012: James Serrin Ⓟ
2016: Reinhard Selten Ⓟ
2020: Peter Borwein Ⓟ
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