On this day in 1539, Girolamo Cardan wrote to Niccolò Tartaglia in an attempt to understand why his calculations involving the square roots of negative numbers sometimes gave the correct answer. He said that his calculation was as subtle as it is useless.
On this day in 2014 Google released a Venn doodle.
Click on Ⓟ for a poster.
Born:
1805: William Rowan Hamilton Ⓟ
John Venn
1843: Mauritz Dahlin Ⓟ
1893: Francis Murnaghan Ⓟ
1909: Saunders Mac Lane Ⓟ
1912: Aleksandr Aleksandrov Ⓟ
1939: Brian Sleeman Ⓟ
Died:
1812: Georg Klügel Ⓟ
1874: Otto Hesse Ⓟ
1906: Joseph Tilly Ⓟ
1945: Gerhard Gentzen Ⓟ
1967: Archibald Macintyre Ⓟ
2009: James Wiegold Ⓟ
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