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On This Day ...

Important events from the history of math that happened on this day:

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November 16th

1823 Birthdate of Jacob Amsler, inventor of the polar planimeter, a device for measuring areas enclosed by plane curves, which he invented in 1854.

More information about:
Jacob Amsler
The Planimeter
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
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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