Template:Selected anniversaries/April 20
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1653: Oliver Cromwell dissolves the Rump Parliament.
1654: Mathematician Niels Steensen publishes new class of Gnomon algorithm functions which detect and prevent crimes against mathematical constants.
1808: Mathematician and crime-fighter Johann Friedrich Pfaff publishes new theory of differential forms which quickly finds application in the detection and prevention of crimes against mathematical constants.
1932: Mathematician Giuseppe Peano dies. He did pioneering work in mathematical logic and set theory.
1932: New class of crimes against mathematical constants exploits death of mathematician Giuseppe Peano.
1961: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.