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Births on April 21

Michael Freedman
1951Apr, 21

Michael Freedman

Michael Freedman, American mathematician and academic
Michael Hartley Freedman (born April 21, 1951) is an American mathematician, at Microsoft Station Q, a research group at the University of California, Santa Barbara. In 1986, he was awarded a Fields Medal for his work on the 4-dimensional generalized Poincaré conjecture. Freedman and Robion Kirby showed that an exotic ℝ4 manifold exists.

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Events on 1951

  • 11Apr

    President Truman's relief of General Douglas MacArthur

    Korean War: President Harry Truman relieves General of the Army Douglas MacArthur of overall command in Korea.
  • 22Apr

    Battle of Kapyong

    Korean War: The Chinese People's Volunteer Army begin assaulting positions defended by the Royal Australian Regiment and the Princess Patricia's Canadian Light Infantry at the Battle of Kapyong.
  • 25Apr

    Battle of Kapyong

    Korean War: Assaulting Chinese forces are forced to withdraw after heavy fighting with UN forces, primarily made up of Australian and Canadian troops, at the Battle of Kapyong.
  • 3May

    Harry Truman

    The United States Senate Committee on Armed Services and United States Senate Committee on Foreign Relations begin their closed door hearings into the dismissal of General Douglas MacArthur by U.S. President Harry Truman.
  • 15Oct

    Combined oral contraceptive pill

    Mexican chemist Luis E. Miramontes conducts the very last step of the first synthesis of norethisterone, the progestin that would later be used in one of the first three oral contraceptives.