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On This Day

  • 6-29-1877

    Cantor to Dedekind: "I see it, but I don't believe it." After proving that the points in a square can be put in one-to-one correspondence with the points on a line segment, Cantor wrote to his friend Dedekind, "Je le vois, mais je ne le crois pas."

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    Georg Cantor
    Richard Dedekind

  • 6-29-1893

    Topologist Eduard Cech born in Stracov, Bohemia (now Czech Republic). He died in 1960 in Prague in what was then Czechoslovakia. He and Hurewicz invented the higher homotopy groups.

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    Eduard Cech

  • 6-29-1904

    Topologist Witold Hurewicz born in Lodz, Poland. He died in 1956 when he fell off a pyramid while attending a conference in Mexico. He and Cech invented the higher homotopy groups.

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    Witold Hurewicz