Template:Selected anniversaries/April 20: Difference between revisions
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File:Johann Friedrich Pfaff.jpg|link=Johann Friedrich Pfaff (nonfiction)|1790: Mathematician and detective [[Johann Friedrich Pfaff (nonfiction)|Johann Friedrich Pfaff]] uses partial differential equations of the first order Pfaffian systems to track and erase the [[Forbidden Ratio]]. | File:Johann Friedrich Pfaff.jpg|link=Johann Friedrich Pfaff (nonfiction)|1790: Mathematician and detective [[Johann Friedrich Pfaff (nonfiction)|Johann Friedrich Pfaff]] uses partial differential equations of the first order Pfaffian systems to track and erase the [[Forbidden Ratio]]. | ||
||1809: James David Forbes born ... physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer. | ||1809: James David Forbes born ... physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer. Pic. | ||
||1831: John Abernethy dies ... surgeon and anatomist. | ||1831: John Abernethy dies ... surgeon and anatomist. | ||
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||1933: Boris Lvovich Rosing dies ... scientist and inventor in the field of television Pic. | ||1933: Boris Lvovich Rosing dies ... scientist and inventor in the field of television Pic. | ||
||1940: Charles Sumner Tainter dies ... engineer and inventor ... scientific instrument maker, engineer and inventor, best known for his collaborations with Alexander Graham Bell, Chichester Bell, Alexander's father-in-law Gardiner Hubbard, and for his significant improvements to Thomas Edison's phonograph, resulting in the Graphophone, one version of which was the first Dictaphone. Pic. | |||
||1940: George Oster born ... mathematical biologist. No pic Wikipedia. See http://news.berkeley.edu/2018/04/20/george-oster-pioneer-in-applying-mathematics-to-biology-dies-at-77/ | ||1940: George Oster born ... mathematical biologist. No pic Wikipedia. See http://news.berkeley.edu/2018/04/20/george-oster-pioneer-in-applying-mathematics-to-biology-dies-at-77/ | ||
Revision as of 08:17, 31 March 2019
1548: Mathematician, astronomer, and alleged time-traveller Petrus Apianus publishes Cosmographicus furatis, his magisterial treatise on crimes against astronomical constants.
1653: Oliver Cromwell dissolves the Rump Parliament.
1790: Mathematician and detective Johann Friedrich Pfaff uses partial differential equations of the first order Pfaffian systems to track and erase the Forbidden Ratio.
1902: Pierre and Marie Curie refine radium chloride.
1903: Leeches in Tempest prognosticator go on strike, demanding "less tempest and more prognostication."
1932: Mathematician Giuseppe Peano dies. He did pioneering work in mathematical logic and set theory.
1933: Art critic and alleged time-traveller The Eel is caught in the act of cracking a safe.
1945: Mathematician Georg Feigl dies. He worked on the foundations of geometry and topology, studying fixed point theorems for n-dimensional manifolds. Feigl was one of the initial authors of the Mathematisches Wörterbuch.
1960: Industrialist, public motivational speaker, and alleged crime boss Baron Zersetzung calls the upcoming Bay of Pigs Invasion "a rock-solid business investment which is certain to generate handsome returns for early investors."
1961: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.
1962: Traces of Clandestiphrine residue are detected at the Bay of Pigs, raising questions about CIA involvement with transdimensional drugs.
2018: Chromatographic analysis of Two Creatures 6 unexpectedly reveals previously unknown color.