Template:Selected anniversaries/September 2

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  1865: Physicist, astronomer, and mathematician William Rowan Hamilton dies. He made important contributions to classical mechanics, optics, and algebra, inventing the quaternion.

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  1947: Mathematician and crimefighter Haskell Curry publishes new theory of combinatory logic which uses Gnomon algorithm functions to detect and prevent crimes against mathematical constants.

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  1948: Archaeologist and spy Sylvanus Morley dies. He conducted espionage in Mexico on behalf of the United States during World War I; the scope of these activities only came to light well after his death.

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  1999: Signed first edition of The Eel Escapes Hydrolab sells for one and a half million dollars.

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  2017: Quaternion multiplication table sells for two million dollars.