Births on April 21

Michael Freedman

Born on April 21, 1951

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.

References

Michael Freedman

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Events on 1951

11 Apr

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.
22 Apr

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.
25 Apr

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.
3 May

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.
15 Oct

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.

Births on April 21

Michael Freedman

Born on April 21, 1951

References

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Events on 1951

President Truman's relief of General Douglas MacArthur

Battle of Kapyong

Battle of Kapyong

Harry Truman

Combined oral contraceptive pill