Deaths on April 21

Emil Leon Post

Died on April 21, 1954

Emil Leon Post, Polish-American mathematician and logician (b. 1897)

Emil Leon Post (; February 11, 1897 – April 21, 1954) was an American mathematician and logician. He is best known for his work in the field that eventually became known as computability theory.

References

Emil Leon Post

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Events on 1954

13 Feb

NCAA Division I
Frank Selvy becomes the only NCAA Division I basketball player ever to score 100 points in a single game.
28 Feb

NTSC
The first color television sets using the NTSC standard are offered for sale to the general public.
1 Apr

United States Air Force Academy
United States President Dwight D. Eisenhower authorizes the creation of the United States Air Force Academy in Colorado.
25 Apr

Bell Labs
The first practical solar cell is publicly demonstrated by Bell Telephone Laboratories.
18 Jun

1954 Guatemalan coup d'état
Carlos Castillo Armas leads an invasion force across the Guatemalan border, setting in motion the 1954 Guatemalan coup d'état

Deaths on April 21

Emil Leon Post

Died on April 21, 1954

References

Choose Another Date

Events on 1954

NCAA Division I

NTSC

United States Air Force Academy

Bell Labs

1954 Guatemalan coup d'état