Template:Selected anniversaries/October 23: Difference between revisions
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||1852: De Morgan conveyed Four Color Problem to Hamilton, writing, "A student of mine asked me today to give him a reason for a fact which I did not know was a fact—and do not yet. He says that if a figure be anyhow divided and the compartments differently coloured so that the figures with any portion of common boundary line are differently coloured—four colours may be wanted, but not more… Query cannot a necessity for five or more be invented." | ||1852: De Morgan conveyed Four Color Problem to Hamilton, writing, "A student of mine asked me today to give him a reason for a fact which I did not know was a fact—and do not yet. He says that if a figure be anyhow divided and the compartments differently coloured so that the figures with any portion of common boundary line are differently coloured—four colours may be wanted, but not more… Query cannot a necessity for five or more be invented." | ||
||1865: Piers Bohl born ... mathematician, who worked in differential equations, topology and quasi-periodic functions. Pic: https://timenote.info/en/Piers-Bohl | |||
File:William_D._Coolidge.jpg|link=William D. Coolidge (nonfiction)|1873: Physicist and engineer [[William D. Coolidge (nonfiction)|William D. Coolidge]] born. He will make major contributions to X-ray machines, and develop ductile tungsten for incandescent light bulbs. | File:William_D._Coolidge.jpg|link=William D. Coolidge (nonfiction)|1873: Physicist and engineer [[William D. Coolidge (nonfiction)|William D. Coolidge]] born. He will make major contributions to X-ray machines, and develop ductile tungsten for incandescent light bulbs. | ||
Revision as of 13:44, 24 October 2018
1590: Astronomer and crime analyst Tycho Brahe publicly accuses rogue astronomers associated with the House of Malevecchio of committing a series of high-profile crimes against astronomical constants.
1634: Minister, scholar, astronomer, mathematician, and crime-fighter Wilhelm Schickard writes two letters, each describing a new technique for detecting and preventing crimes against astronomical constants.
1873: Physicist and engineer William D. Coolidge born. He will make major contributions to X-ray machines, and develop ductile tungsten for incandescent light bulbs.
1973: Watergate scandal: President Richard M. Nixon agrees to turn over subpoenaed audio tapes of his Oval Office conversations.
2014: Physicist and academic Tullio Regge dies. In 1968 he and G. Ponzano developed a quantum version of Regge calculus in three space-time dimensions now known as the Ponzano-Regge model; this was the first of a whole series of state sum models for quantum gravity known as spin foam models.
2016: Steganographic analysis of The Eel Time-Surfing reveals quantum gravity control software based on spin foam models.