Template:Selected anniversaries/May 9
1746: Mathematician and engineer Gaspard Monge born. He will invent descriptive geometry, and do pioneering work in differential geometry.
1842: Niles Cartouchian and Egon Rhodomunde Confront Gnotilus causes widespread debate about the role of private citizens in fighting crimes against mathematical constants.
1940: John Brunner uses a Lee and Turner scrying engine to compute the "near certain probability" that the Royal Navy will succeed in capturing the German submarine U-110.
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.
1948: The United States Army Signal Corps uses Project Diana antenna to pre-visualize crimes against mathematical constants.