You are here

On This Day

  • 7-20-1632

    Carcavi entered parlement. Pierre de Carcavi became a member of the parlement of Toulouse, France. His friendship with Fermat dates from this time, and eventually would lead to friendships with Descartes, Pascal, and Mersenne.

    More information about:
    Pierre de Carcavi
    Pierre de Fermat
  • 7-20-1819

    John Playfair died in Fife, Scotland. He is most famous for using Playfair's Axiom (or the Playfair Postulate), which he attributed to Proclus, to replace Euclid's Parallel Postulate.

    More information about:
    John Playfair
  • 7-20-1866

    Bernhard Riemann died in Selasca, Italy. Most famous for Riemannian space and the Riemann integral, he was a student of Eisenstein, Dirichlet, and Gauss.

    More information about:
    Bernhard Riemann
  • 7-20-1969

    Neil Armstrong was the first man on the moon, with Buzz Aldrin a close second.

    More information about:
    Apollo 11 Lunar Landing
    Neil Armstrong
    Buzz Aldrin