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On This Day

  • 5-22-1649

    Blaise Pascal obtained by royal decree a monopoly for his computing machine.

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    Blaise Pascal
  • 5-22-1866

    Helmholtz published "On the facts that underlie the foundations of geometry," containing an account of elliptic geometry.

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    Hermann von Helmholtz
    Elliptic Geometry
  • 5-22-1868

    Julius Plucker died in Bonn, Germany. A geometer and physicist, he anticipated the combinatorial constructs of Steiner systems and block designs.

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    Julius Plucker
  • 5-22-2010

    Martin Gardner, author of the "Mathematical Games" column in Scientific American Magazine, died in Norman, Oklahoma, on this day.

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    Martin Gardner