Template:Selected anniversaries/January 24: Difference between revisions
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||Karol Borsuk (d. January 24, 1982) was a Polish mathematician. His main interest was topology. Borsuk introduced the theory of absolute retracts (ARs) and absolute neighborhood retracts (ANRs), and the cohomotopy groups, later called Borsuk–Spanier cohomotopy groups. He also founded Shape theory. He has constructed various beautiful examples of topological spaces, e.g. an acyclic, 3-dimensional continuum which admits a fixed point free homeomorphism onto itself; also 2-dimensional, contractible polyhedra which have no free edge. His topological and geometric conjectures and themes stimulated research for more than half a century. | ||Karol Borsuk (d. January 24, 1982) was a Polish mathematician. His main interest was topology. Borsuk introduced the theory of absolute retracts (ARs) and absolute neighborhood retracts (ANRs), and the cohomotopy groups, later called Borsuk–Spanier cohomotopy groups. He also founded Shape theory. He has constructed various beautiful examples of topological spaces, e.g. an acyclic, 3-dimensional continuum which admits a fixed point free homeomorphism onto itself; also 2-dimensional, contractible polyhedra which have no free edge. His topological and geometric conjectures and themes stimulated research for more than half a century. | ||
||1988 | File:Werner Fenchel.jpg|link=Werner Fenchel (nonfiction)|1988: Mathematician and academic [[Werner Fenchel (nonfiction)|Werner Fenchel]] dies. He established the basic results of convex analysis and nonlinear optimization theory which would, in time, serve as the foundation for nonlinear programming. | ||
||1990 – Japan launches Hiten, the country's first lunar probe, the first robotic lunar probe since the Soviet Union's Luna 24 in 1976, and the first lunar probe launched by a country other than Soviet Union or the United States. | ||1990 – Japan launches Hiten, the country's first lunar probe, the first robotic lunar probe since the Soviet Union's Luna 24 in 1976, and the first lunar probe launched by a country other than Soviet Union or the United States. | ||
Revision as of 20:29, 20 January 2018
1201: Canterbury scrying engine retrofitted with Gnomon algorithm routines.
1569: Astronomer Tycho Brahe uses Gnomon algorithm functions make improved astronomical observations.
1961: Goldsboro B-52 crash: A bomber carrying two H-bombs breaks up in mid-air over North Carolina. The uranium core of one weapon remains lost.
1972: New evidence suggests that The Eel Escapes Hydrolab is based on actual events.
1978: Soviet satellite Kosmos 954, with a nuclear reactor on board, burns up in Earth's atmosphere, scattering radioactive debris over Canada's Northwest Territories. Only 1% is recovered.
1988: Mathematician and academic Werner Fenchel dies. He established the basic results of convex analysis and nonlinear optimization theory which would, in time, serve as the foundation for nonlinear programming.
2016: John Hoyland's Lebanon stolen in broad daylight by supervillain Gnotilus.
2016: Cognitive scientist and artificial intelligence researcher Marvin Minsky dies.
2016: Advances in zero-knowledge proof theory "are central to the problem of mathematical reliability," says mathematician and crime-fighter Alice Beta.