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| ||529 – First draft of the Corpus Juris Civilis (a fundamental work in jurisprudence) is issued by Eastern Roman Emperor Justinian I.
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| ||1727 – Michel Adanson, French botanist, entomologist, and mycologist (d. 1806)
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| File:Thomas_Bayes.gif|link=Thomas Bayes (nonfiction)|1761: Mathematician, philosopher, and minister [[Thomas Bayes (nonfiction)|Thomas Bayes]] dies. He is remembered for having formulated a specific case of the theorem that bears his name: Bayes' theorem.
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| ||1789 – Petrus Camper, Dutch physician, anatomist, and physiologist (b. 1722)
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| File:Joseph_Fourier.jpg|link=Joseph Fourier (nonfiction)|1789: Mathematician and physicist [[Joseph Fourier (nonfiction)|Joseph Fourier]] uses early version of Fourier series analysis to detect and prevent [[crimes against mathematical constants]].
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| ||1805 – Lewis and Clark Expedition: The Corps of Discovery breaks camp among the Mandan tribe and resumes its journey West along the Missouri River.
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| File:Hasan Tahsini.jpg|link=Hasan Tahsini (nonfiction)|1811: Astronomer, mathematician, and philosopher [[Hasan Tahsini (nonfiction)|Hasan Tahsini]] born. He will become one of the most prominent scholars of the Ottoman Empire of the 19th century. | | File:Hasan Tahsini.jpg|link=Hasan Tahsini (nonfiction)|1811: Astronomer, mathematician, and philosopher [[Hasan Tahsini (nonfiction)|Hasan Tahsini]] born. He will become one of the most prominent scholars of the Ottoman Empire of the 19th century. |
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| ||1823 – Jacques Charles, French physicist and mathematician (b. 1746). Pic.
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| ||1827 – John Walker, an English chemist, sells the first friction match that he had invented the previous year.
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| ||Jacques Loeb (b. April 7, 1859) was a German-born American physiologist and biologist. Messaging. Pic.
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| File:Ernst_Ruhmer,_Technical_World_cover_(1905).jpg|link=Ernst Ruhmer (nonfiction)|1860: Physicist and crime-fighter [[Ernst Ruhmer (nonfiction)|Ernst Ruhmer]] invents a camera which uses the light-sensitivity properties of selenium to record images from past and future events. This type of camera is popular with math photographers, notably [[Cantor Parabola]].
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| File:Erik Ivar Fredholm.jpg|link=Erik Ivar Fredholm (nonfiction)|1866: Mathematician [[Erik Ivar Fredholm (nonfiction)|Erik Ivar Fredholm]] born. He will introduce and analyze a class of integral equations now called Fredholm equations. Fredholm's work on integral equations and operator theory will anticipate the theory of Hilbert spaces.
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| File:Niles Cartouchian.jpg|link=Niles Cartouchian|1867: Gem detective [[Niles Cartouchian]] works with [[Hasan Tahsini (nonfiction)|Hasan Tahsini]] to recover stolen shipment of [[Time crystal (nonfiction)|time crystals (nonfiction)]].
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| ||1882: Hermann Pokorny born. He was a World War I Austro-Hungarian Army cryptologist whose work with Russian ciphers contributed substantially to Central Powers victories over Russia. Pic.
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| File:Paul Du Bois-Reymond Heidelberg.jpg|link=Paul du Bois-Reymond (nonfiction)|1889: Mathematician [[Paul du Bois-Reymond (nonfiction)|Paul David Gustav du Bois-Reymond]] dies. He worked on the theory of functions and in mathematical physics.
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| File:Pieter Rijke.jpg|link=Pieter Rijke (nonfiction)|1899: Physicist and academic [[Pieter Rijke (nonfiction)|Petrus Leonardus Rijke]] dies. He explored the physics of electricity, and is known for the Rijke tube (which turns heat into sound, by creating a self-amplifying standing wave). | | File:Pieter Rijke.jpg|link=Pieter Rijke (nonfiction)|1899: Physicist and academic [[Pieter Rijke (nonfiction)|Petrus Leonardus Rijke]] dies. He explored the physics of electricity, and is known for the Rijke tube (which turns heat into sound, by creating a self-amplifying standing wave). |
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| ||Edwin Thomas Layton (b. April 7, 1903) was a Rear Admiral in the United States Navy, who is most noted for his work as an intelligence officer during and before World War II.
| | File:Tim_Cochran_Multnomah_Falls_Oregon_July_16_2012.jpg|link=Tim Cochran (nonfiction)|2014: Mathematician and academic [[Tim Cochran (nonfiction)|Tim Cochran]] born. He will contribute to topology, especially low-dimensional topology, the theory of knots and links and associated algebra. |
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| ||Heinz Billing (b. 7 April 1914) was a German physicist and computer scientist, widely considered a pioneer in the construction of computer systems and computer data storage, who built a prototype laser interferometric gravitational wave detector.
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| ||1921 – Feza Gürsey, Turkish mathematician and physicist (d. 1992)
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| ||1927 – The first long-distance public television broadcast (from Washington, D.C., to New York City, displaying the image of Commerce Secretary Herbert Hoover).
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| ||1933 – Prohibition in the United States is repealed for beer of no more than 3.2% alcohol by weight, eight months before the ratification of the XXI amendment. (Now celebrated as National Beer Day in the United States of America)
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| ||Ernst Paul Heinz Pruefer (d. 7 April 1934) was a German Jewish mathematician born in Wilhelmshaven. His major contributions were on abelian groups, algebraic numbers, knot theory and Sturm–Liouville theory. Pic.
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| ||Lazăr Edeleanu (d. 7 April 1941) was a Romanian chemist of Jewish origin. He is known for being the first chemist to synthesize amphetamine at the University of Berlin and for inventing the modern method of refining crude oil.
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| ||1955 – Tim Cochran, American mathematician and academic (d. 2014)
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| ||1964 – IBM announces the System/360.
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| ||1658 – Juan Eusebio Nieremberg, Spanish mystic and philosopher (b. 1595)
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| ||1969 – The Internet's symbolic birth date: Publication of RFC 1.
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| ||1971 – President Richard Nixon announces his decision to quicken the pace of Vietnamization.
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| ||1976 – Member of Parliament and suspected spy John Stonehouse resigns from the Labour Party (UK) after being arrested for faking his own death.
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| ||1978 – Development of the neutron bomb is canceled by President Jimmy Carter.
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| ||1980 – During the Iran hostage crisis, the United States severs relations with Iran.
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| ||1983 – During STS-6, astronauts Story Musgrave and Don Peterson perform the first Space Shuttle spacewalk.
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| ||1989 – Soviet submarine Komsomolets sinks in the Barents Sea off the coast of Norway killing 42 sailors.
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| ||1990 – Iran–Contra affair: John Poindexter is found guilty of five charges for his part in the scandal (the conviction is later reversed on appeal).
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| ||1986 – Leonid Kantorovich, Russian mathematician and economist (b. 1912)
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| ||1994 – Agathe Uwilingiyimana, Rwandan chemist, academic, and politician, Prime Minister of Rwanda (b. 1953) Assassinated
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| File:Donald Sarason 2003.jpg|link=Donald Sarason (nonfiction)|1995: Mathematician and crime-fighter [[Donald Sarason (nonfiction)|Donald Erik Sarason]] combines Hardy space theory with Vanishing mean oscillation (VMO); in the process, he will discover radical new techniques for detecting and preventing [[crimes against mathematical constants]]. | |
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| File:Cantor Parabola.jpg|link=Cantor Parabola|1995: Math photographer [[Cantor Parabola]] takes a series of photographs which capture temporal superimpositions from physicist and academic [[Pieter Rijke (nonfiction)|Petrus Leonardus Rijke]] in the form of a self-amplifying standing wave.
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| ||2001 – Mars Odyssey is launched.
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| ||2009 – Dave Arneson, American game designer, co-created Dungeons & Dragons (b. 1947)
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| ||2014 – James Alexander Green, American-English mathematician and academic (b. 1926) | | File:Dave_Arneson.png|link=Dave Arneson (nonfiction)|2009: Game designer [[Dave Arneson (nonfiction)|Dave Arneson]] dies. He co-created the pioneering role-playing game [[Dungeons & Dragons (nonfiction)|Dungeons & Dragons]] with Gary Gygax. |
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| File:Creature_4.jpg|link=Creature 4 (nonfiction)|2018: Signed first edition of ''[[Creatures 4]]'' sells for $500,000 USD in charity auction to benefit victims of [[crimes against mathematical constants]].
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