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On This Day

  • 4-25-1849

    Felix Klein born in Dusseldorf, Prussia. In 1871 he constructed projective models for the three types of non-Euclidean geometries--the so-called Klein models. This work popularized non-Euclidean geometries among mathematicians.

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    Felix Klein
    Klein Bottle

  • 4-25-1879

    Edwin Bidwell Wilson born in Hartford, Connecticut. As a student of J. Willard Gibbs at Yale he codified the physicist's lectures on vector analysis into a textbook (1901) that profoundly influenced the use and notation of the subject. In 1912 he published a comprehensive text on advanced calculus that was the first really modern book of its kind in the U.S.

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    Edwill Bidwell Wilson
    Josiah Willard Gibbs

  • 4-25-2038

    Easter Day 2038. This is the next time that Easter will occur on April 25th, the latest possible date. The last time Easter was on April 25 was in 1943.

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    The Date of Easter