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On This Day

  • 12-16-1627

    Cavalieri announced to Galileo and Cardinal Borromeo that he had completed his Geometria, which contains his method of indivisibles, now known as Cavalieri's principle.

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    Bonaventura Cavalieri
    Cavalieri's Principle
  • 12-16-1799

    Gauss wrote Farkas Bolyai that he was sorry they had not discussed the theory of parallels during their student days together at Gottingen (1796-1798). Farkas Bolyai may be most famous for discouraging his son Janos from studying Euclid's Parallel Postulate and Janos for ignoring his father's advice and inventing non-Euclidean geometry.

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    Farkas Bolyai
    Janos Bolyai
    Carl Friedrich Gauss
  • 12-16-1861

    Weierstrass, who for twelve years had endured painful attacks of vertigo, suffered a complete collapse of his health due to overwork. Henceforth, he always lectured while seated, consigning the blackboard work to an advanced student. Nevertheless, he eventually became a recognized master teacher.

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    Karl Weierstrass