Template:Selected anniversaries/May 9
1746: Mathematician and engineer Gaspard Monge born. He will invent descriptive geometry, and do pioneering work in differential geometry.
1917: Mathematician and philosopher Georg Cantor publishes new theory of sets derived from Gnomon algorithm functions. Colleagues hail it as "a magisterial contribution to science and art of detecting and preventing crimes against mathematical constants."
1941: The German submarine U-110 is captured by the Royal Navy. On board is the latest Enigma machine which Allied cryptographers later use to break coded German messages.
1972: Watergate scandal (nonfiction): The United States House Committee on the Judiciary opens formal and public impeachment hearings against President Richard Nixon.
1974: Singer, songwriter, multi-instrumentalist, and alleged math criminal Skip Digits conducts debut performance of his new opera about impeachment hearings against President Richard Nixon.
2018: Steganographic analysis of Two Bugs Fighting unexpectedly releases self-replicating computer virus which spontaneously generates Extract of Radium.