births
Leon Henkin, American logician (died 2006)
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Leon Henkin
American mathematician
Leon Albert Henkin was an American logician, whose works played a strong role in the development of logic, particularly in the theory of types. He was an active scholar at the University of California, Berkeley, where he made great contributions as a researcher and teacher, as…Source: Wikipedia (CC BY-SA)
April 19
Day of the year
April 19 is the 109th day of the year in the Gregorian calendar; 256 days remain until the end of the year.Source: Wikipedia (CC BY-SA)