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On This Day

  • 11-24-1639

    Transit of Venus first observed by Jeremiah Horrocks, who described it in Venus in Sole Visa.

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    Jeremiah Horrocks
    Horrocks' Account of the 1639 Transit
  • 11-24-1759

    Lagrange wrote Euler that he believed that he had developed the true metaphysics of the calculus; at that time he seems to have been convinced that the use of infinitesimals was rigorous. Lagrange attempted to prove Taylor's Theorem, the power of which he was the first to observe, and then to develop the entire calculus from it.

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    Joseph-Louis Lagrange
    Leonhard Euler
    Taylor's Theorem
  • 11-24-1858

    Dedekind discovered his cuts, representing real numbers in terms of rationals, and thereby provided the first correct definition of continuity.

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    Richard Dedekind