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On This Day

  • 1-24-1640

    John Pell wrote Marin Mersenne that Thomas Harriot (1560-1621) had found the law of refraction, now known as Snell's law.

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    John Pell
    Marin Mersenne
    Thomas Harriot
    Snell's Law
  • 1-24-1798

    Karl von Staudt, pioneer in projective and synthetic geometry, born in Rothenburg ob der Tauber, Germany.

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    Karl von Staudt
  • 1-24-1955

    Percy Heawood died in Durham, England, where he had spent his entire career as a math professor, much of it working on map colorings and attempts to prove the Four Color Theorem.

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    Percy Heawood