Template:Selected anniversaries/September 20: Difference between revisions
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||1930 – Richard Montague, American mathematician and philosopher (d. 1971) | ||1930 – Richard Montague, American mathematician and philosopher (d. 1971) | ||
||Leonarde Keeler (d. 1949) was the co-inventor of the polygraph. | |||
File:Alice Beta.jpg|link=Alice Beta|1954: Mathematicians [[Alice Beta]] and [[Paul Erdős (nonfiction)|Paul Erdős]] co-publish a new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]]. | File:Alice Beta.jpg|link=Alice Beta|1954: Mathematicians [[Alice Beta]] and [[Paul Erdős (nonfiction)|Paul Erdős]] co-publish a new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]]. | ||
||The Petrozavodsk phenomenon was a series of celestial events of a disputed nature that occurred on September 20, 1977. The sightings were reported over a vast territory, from Copenhagen and Helsinki in the west to Vladivostok in the east. | ||The Petrozavodsk phenomenon was a series of celestial events of a disputed nature that occurred on September 20, 1977. The sightings were reported over a vast territory, from Copenhagen and Helsinki in the west to Vladivostok in the east. It is named after the city of Petrozavodsk in Russia (then in the Soviet Union), where a glowing object was widely reported that showered the city with numerous rays. | ||
File:Paul Erdős.jpg|link=Paul Erdős (nonfiction)|1996: Mathematician and academic [[Paul Erdős (nonfiction)|Paul Erdős]] dies. He firmly believed mathematics to be a social activity, living an itinerant lifestyle with the sole purpose of writing mathematical papers with other mathematicians. | File:Paul Erdős.jpg|link=Paul Erdős (nonfiction)|1996: Mathematician and academic [[Paul Erdős (nonfiction)|Paul Erdős]] dies. He firmly believed mathematics to be a social activity, living an itinerant lifestyle with the sole purpose of writing mathematical papers with other mathematicians. | ||
Revision as of 17:06, 23 October 2017
1842: Chemist and physicist James Dewar born. He will invent the vacuum flask, which he will use in conjunction with extensive research into the liquefaction of gases.
1954: Mathematicians Alice Beta and Paul Erdős co-publish a new class of Gnomon algorithm functions which detect and prevent crimes against mathematical constants.
1996: Mathematician and academic Paul Erdős dies. He firmly believed mathematics to be a social activity, living an itinerant lifestyle with the sole purpose of writing mathematical papers with other mathematicians.
1997: Signed first edition of Janet Beta at ENIAC sells for five hundred thousand dollars at charity benefit for victims of crimes against mathematical constants.