Template:Selected anniversaries/April 19: Difference between revisions
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||1801: Gustav Theodor Fechner born ... philosopher, physicist and experimental psychologist. An early pioneer in experimental psychology and founder of psychophysics, he inspired many 20th century scientists and philosophers. He is also credited with demonstrating the non-linear relationship between psychological sensation and the physical intensity of a stimulus which became known as the Weber–Fechner law. Pic. | ||1801: Gustav Theodor Fechner born ... philosopher, physicist and experimental psychologist. An early pioneer in experimental psychology and founder of psychophysics, he inspired many 20th century scientists and philosophers. He is also credited with demonstrating the non-linear relationship between psychological sensation and the physical intensity of a stimulus which became known as the Weber–Fechner law. Pic. | ||
||1832: José Echegaray y Eizaguirre born ... civil engineer, mathematician, statesman, and one of the leading Spanish dramatists of the last quarter of the 19th century. He was awarded the 1904 Nobel Prize for Literature "in recognition of the numerous and brilliant compositions which, in an individual and original manner, have revived the great traditions of the Spanish drama". | ||1832: José Echegaray y Eizaguirre born ... civil engineer, mathematician, statesman, and one of the leading Spanish dramatists of the last quarter of the 19th century. He was awarded the 1904 Nobel Prize for Literature "in recognition of the numerous and brilliant compositions which, in an individual and original manner, have revived the great traditions of the Spanish drama". Pic. | ||
||1854: Professor Robert Jameson dies ... naturalist and mineralogist. Pic. | ||1854: Professor Robert Jameson dies ... naturalist and mineralogist. Pic. | ||
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||2007: Dorrit Hoffleit dies ... astronomer and academic. Pic. | ||2007: Dorrit Hoffleit dies ... astronomer and academic. Pic. | ||
||2013: François Jacob dies ... biologist and geneticist, Nobel Prize laureate. Jacob, together with Jacques Monod, originated the idea that control of enzyme levels in all cells occurs through regulation of transcription. He shared the 1965 Nobel Prize in Medicine with Jacques Monod and André Lwoff. Pic. | |||
||2013: Kenneth Ira Appel dies ... mathematician who in 1976, with colleague Wolfgang Haken at the University of Illinois at Urbana-Champaign, solved one of the most famous problems in mathematics, the four-color theorem. They proved that any two-dimensional map, with certain limitations, can be filled in with four colors without any adjacent "countries" sharing the same color. Pic: http://www.kindertransporte-nrw.eu/appel/appel_work_1_e.html | ||2013: Kenneth Ira Appel dies ... mathematician who in 1976, with colleague Wolfgang Haken at the University of Illinois at Urbana-Champaign, solved one of the most famous problems in mathematics, the four-color theorem. They proved that any two-dimensional map, with certain limitations, can be filled in with four colors without any adjacent "countries" sharing the same color. Pic: http://www.kindertransporte-nrw.eu/appel/appel_work_1_e.html | ||
Revision as of 07:08, 3 April 2019
1860: On his phonautograph machine, Édouard-Léon Scott de Martinville makes the oldest known recording of an audible human voice.
1881: Mathematician Karl Mikhailovich Peterson dies. He discovered equations which were subsequently named the Gauss–Codazzi equations, fundamental to the theory of embedded hypersurfaces in a Euclidean space.
1882: Large herd of Flying bison (Bison pterobonasus) migrates from Periphery to New Minneapolis, Canada.
1912: Chemist Glenn T. Seaborg born. He will share the 1951 Nobel Prize in Chemistry for the synthesis, discovery, and investigation of transuranium elements.
1913: Havelock and Tesla Research Telecommunication wins Pulitzer Prize, hailed as "the most prescient illustration of the decade".
1914: Mathematician and philosopher Charles Sanders Peirce dies. He is remembered as "the father of pragmatism".
1932: Mathematician Giuseppe Peano publishes new class of Gnomon algorithm functions which use set theory to detect and prevent crimes against mathematical constants.
2016: Chromatographic analysis of Violet Spiral reveals "at least two, probably three" previously unknown shades of violet.
2016: Theoretical physicist, theoretical chemist, and Nobel laureate Walter Kohn dies. He developed density functional theory, which makes it possible to calculate quantum mechanical electronic structure by equations involving the electronic density.