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On This Day

  • 4-20-1344

    Levi ben Gerson died in Avignon, France. He invented the astronomical instrument known as 'Jacob's staff' and proved combinatorial identities using a form of mathematical induction.

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    Levi ben Gerson

  • 4-20-1932

    Giuseppe Peano died in Turin, Italy. He was 73 and taught his regular classes the day before he died. He axiomatized the natural numbers, elementary geometry, and many other systems. One could say that axiomatization was Peano's forte!

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    Giuseppe Peano
    Peano's Axioms

  • 4-20-1957

    Konrad Knopp, the German complex analyst, died in France. He wrote several widely admired texts on complex functions.

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    Konrad Knopp