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On This Day

  • 9-21-1576

    Girolamo Cardano died in Rome. One story says that it was by his own hand so as to fulfill his earlier astrological prediction of his death on this date.

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    Girolamo Cardano
  • 9-21-1781

    Lagrange wrote d'Alembert: "It appears to me also that the mine [of mathematics] is already very deep and that unless one discovers new veins it will be necessary sooner or later to abandon it." This view was prevalent at the end of the eighteenth century.

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    Joseph-Louis Lagrange
    Jean D'Alembert
  • 9-21-1884

    Denes Konig born in Budapest, Hungary. One of the founders of modern graph theory, he would die in Budapest in 1944 during the Nazi occupation of Hungary.

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    Denes Konig