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On This Day

  • 4-2-999

    Gerbert was elected Pope Sylvester II. He introduced into the West the practice of making calculations by using marked discs (apices). This method, which has nearly all the advantages of positional arithmetic, was used in abacus calculations throughout the eleventh and twelfth centuries.

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    Pope Sylvester II
  • 4-2-1933

    Emmy Noether's right to teach at Gottingen was withdrawn because of her Jewish ancestry. The departure of numerous scientists from Germany played a major role in transferring world mathematical leadership to the United States.

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    Emmy Noether
  • 4-2-1934

    Paul Cohen born. In 1963, he proved that the axiom of choice and the continuum hypothesis are independent of the other axioms of set theory.

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    Paul Cohen
    Continuum Hypothesis