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On This Day

  • 7-28-1619

    Kepler wrote to Napier expressing his enthusiasm for Napier's invention of logarithms.

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    Johannes Kepler
    John Napier
    Logarithms
  • 7-28-1866

    Metric system approved in the U.S. The first Act of Congress legalizing the employment of the metric system was approved (14 Stat. L. 339). The act provided that it "shall be lawful throughout the United States of America to employ the weights and measures of the metric system."

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    The Metric System
  • 7-28-1899

    Cantor asked Dedekind whether the set of all cardinal numbers is itself a set, because, if it is, it would have a cardinal number larger than any other cardinal.

    More information about:
    Georg Cantor
    Julius Dedekind
    Cardinal Number

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