Template:Selected anniversaries/October 23: Difference between revisions

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||1581: Michael Neander dies ... mathematician and astronomer. Pic search yes: https://www.google.com/search?q=michael+neander
File:Tycho Brahe.jpg|link=Tycho Brahe (nonfiction)|1590: Astronomer and crime analyst [[Tycho Brahe (nonfiction)|Tycho Brahe]] publicly accuses rogue astronomers associated with the [[House of Malevecchio]] of committing a series of high-profile [[crimes against astronomical constants]].
File:Tycho Brahe.jpg|link=Tycho Brahe (nonfiction)|1590: Astronomer and crime analyst [[Tycho Brahe (nonfiction)|Tycho Brahe]] publicly accuses rogue astronomers associated with the [[House of Malevecchio]] of committing a series of high-profile [[crimes against astronomical constants]].


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||1842: Henry Harrison Chase Dunwoody born. Known in his own time for his work with the Army’s Weather Bureau, Dunwoody invented the carborundum radio detector in 1906. It was the first practical mineral radio wave detector and the first commercial semiconductor device. Pic.
||1842: Henry Harrison Chase Dunwoody born. Known in his own time for his work with the Army’s Weather Bureau, Dunwoody invented the carborundum radio detector in 1906. It was the first practical mineral radio wave detector and the first commercial semiconductor device. Pic.


||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." Pic.


||1865: Piers Bohl born ... mathematician, who worked in differential equations, topology and quasi-periodic functions. Pic: https://timenote.info/en/Piers-Bohl
||1865: Piers Bohl born ... mathematician, who worked in differential equations, topology and quasi-periodic functions. Pic: https://timenote.info/en/Piers-Bohl

Revision as of 11:09, 31 March 2019