Template:Selected anniversaries/July 20: Difference between revisions
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File:MKUltra proposal.jpg|link=Project MKUltra (nonfiction)|1977: [[Project MKUltra (nonfiction)]]: The Central Intelligence Agency releases documents under the Freedom of Information Act revealing it had engaged in mind-control experiments. | File:MKUltra proposal.jpg|link=Project MKUltra (nonfiction)|1977: [[Project MKUltra (nonfiction)]]: The Central Intelligence Agency releases documents under the Freedom of Information Act revealing it had engaged in mind-control experiments. | ||
||Gabriel Andrew Dirac (d. 20 July 1984) was a mathematician who mainly worked in graph theory. He stated a sufficient condition for a graph to contain a Hamiltonian circuit. In 1951 he conjectured that n points in the plane, not all collinear, must span at least [n/2] two-point lines, where [x] is the largest integer not exceeding x. This conjecture is still open. | |||
||Valentine "Valya" Bargmann (d. July 20, 1989) was a German-American mathematician and theoretical physicist. | ||Valentine "Valya" Bargmann (d. July 20, 1989) was a German-American mathematician and theoretical physicist. | ||
||Karl Longin Zeller (d. 2006, Tübingen) was a German mathematician and computer scientist who worked in numerical analysis and approximation theory. He is the namesake of Zeller operators. Zeller was drafted into the German army, and lost his right arm on the Soviet front of World War II. He earned his Ph.D. from the University of Tübingen in 1950, under the supervision of Konrad Knopp and Erich Kamke, | ||Karl Longin Zeller (d. 2006, Tübingen) was a German mathematician and computer scientist who worked in numerical analysis and approximation theory. He is the namesake of Zeller operators. Zeller was drafted into the German army, and lost his right arm on the Soviet front of World War II. He earned his Ph.D. from the University of Tübingen in 1950, under the supervision of Konrad Knopp and Erich Kamke, and remained at Tübingen for most of his career as a professor and as director of the computer center. He left Tübingen in 1959 for a professorship in Stuttgart but returned to Tübingen in 1960 with a personal chair in "the mathematics of supercomputer facilities" (German: Mathematik der Hochleistungsrechenanlagen), making him one of the founders of computer science in Germany. | ||
||Kai Manne Börje Siegbahn (d. 2007) was a Swedish physicist. | ||Kai Manne Börje Siegbahn (d. 2007) was a Swedish physicist. | ||
Revision as of 18:13, 2 December 2017
1866: Mathematician and academic Bernhard Riemann dies. He made contributions to analysis, number theory, and differential geometry.
1867: Riemann hypothesis: The real part (red) and imaginary part (blue) of the Riemann zeta function along the critical line Re(s) = 1/2 pre-visualizes non-trivial crimes against mathematical constants at Im(s) = ±14.135, ±21.022 and ±25.011.
1932: In Washington, D.C., police fire tear gas on World War I veterans, part of the Bonus Expeditionary Force, who attempt to march to the White House.
1937: Businessman and inventor Guglielmo Marconi dies. He shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy".
1938: Mathematician and crime-fighter Ferdinand von Lindemann uses the transcendental property of π (pi) to detect and prevent crimes against mathematical constants.
1977: Project MKUltra (nonfiction): The Central Intelligence Agency releases documents under the Freedom of Information Act revealing it had engaged in mind-control experiments.
2017: Pin Man says he "was involved with Project MKUltra (nonfiction)."