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On This Day

  • 11-16-1823

    Birthdate of Jacob Amsler, inventor of the polar planimeter, a device for measuring areas enclosed by plane curves, which he invented in 1854.

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    Jacob Amsler
    The Planimeter

  • 11-16-1835

    Eugenio Beltrami born in Cremona, Italy. In 1868 he showed the consistency of non-Euclidean geometry by providing a model of it on the pseudosphere, a surface with constant negative curvature.

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    Eugenio Beltrami
    Pseudospheres

  • 11-16-1886

    Marcel Riesz born in Gyor, Hungary. He wrote mathematical papers in five languages, German, Hungarian, French, Swedish, and English, and was the younger brother of Frigyes Riesz of Riesz Representation Theorem fame.

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    Marcel Riesz
    Frigyes (Frederic) Riesz

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