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Descartes's theorem. Descartes's theorem on the "total defect" of a polyhedron states that if the polyhedron is homeomorphic to a sphere (i.e. topologically equivalent to a sphere, so that it may be deformed into a sphere by stretching without tearing), the "total defect", i.e. the sum of the defects of all of the vertices, is two full circles (or 720° or 4 π radians).
Blanche Descartes was a collaborative pseudonym used by the English mathematicians R. Leonard Brooks, Arthur Harold Stone, Cedric Smith, and W. T. Tutte.The four mathematicians met in 1935 as undergraduate students at Trinity College, Cambridge, where they joined the Trinity Mathematical Society and began meeting together to work on mathematical problems.
Charles H. Kraft (b. 1932 in Connecticut) is an American anthropologist, linguist, evangelical Christian speaker, and Professor Emeritus of Anthropology and Intercultural Communication in the School of Intercultural Studies at Fuller Theological Seminary in Pasadena, California, where he taught primarily in the school's spiritual-dynamics concentration.
Kraft Systems, Inc., was an American electronics company based in San Diego County, California, and active from 1962 to 1994. The company was founded by Philip O. Kraft and began as a manufacturer of transmitters for radio-controlled models, namely RC aircraft. In 1972, the company was acquired by the Carlisle Corporation of Cincinnati, Ohio ...
Kraft was born in Worcester, Massachusetts in 1942, the daughter of Frances (Lavine) and Jacob Hiatt. Her father was a Lithuanian Jewish immigrant who had served as a circuit judge of the Court of Lithuania before immigrating in 1935. [3] [4] [5] His parents and three other members of his family were murdered during the Holocaust.
Snell's law (also known as the Snell–Descartes law, the ibn-Sahl law, [1] and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.
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Cubic. Snark. Table of graphs and parameters. In the mathematical field of graph theory, a Descartes snark is an undirected graph with 210 vertices and 315 edges. It is a snark, first discovered by William Tutte in 1948 under the pseudonym Blanche Descartes. [1]