pencil of spheres
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Lie sphere geometry — is a geometrical theory of planar or spatial geometry in which the fundamental concept is the circle or sphere. It was introduced by Sophus Lie in the nineteenth century. [The definitive modern textbook on Lie sphere geometry is Harvnb|Cecil|1992 … Wikipedia
Ellipse — Elliptical redirects here. For the exercise machine, see Elliptical trainer. This article is about the geometric figure. For other uses, see Ellipse (disambiguation). Not to be confused with ellipsis. An ellipse obtained as the intersection of a… … Wikipedia
Timeline of historic inventions — The timeline of historic inventions is a chronological list of particularly important or significant technological inventions. Note: Dates for inventions are often controversial. Inventions are often invented by several inventors around the same… … Wikipedia
M. C. Escher — Maurits Cornelis Escher A 1929 self portrait … Wikipedia
education — /ej oo kay sheuhn/, n. 1. the act or process of imparting or acquiring general knowledge, developing the powers of reasoning and judgment, and generally of preparing oneself or others intellectually for mature life. 2. the act or process of… … Universalium
Union of Soviet Socialist Republics — a former federal union of 15 constituent republics, in E Europe and W and N Asia, comprising the larger part of the former Russian Empire: dissolved in December 1991. 8,650,069 sq. mi. (22,402,200 sq. km). Cap.: Moscow. Also called Russia, Soviet … Universalium
Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… … Universalium
Salvador Dalí — This is a Catalan name. The first family name is Dalí and the second is Domènech. Salvador Dalí Salvador Dalí photographed by Carl Van Vechten on November 29, 1939 Birth name … Wikipedia
Pebble bed reactor — Sketch of a pebble bed reactor in Italian … Wikipedia
Invasion of Poland (1939) — Infobox Military Conflict partof=World War II caption=German battleship Schleswig Holstein , shelling Westerplatte, 1 September 1939. date=1 September – 6 October 1939 place=Poland result=Decisive Axis and Soviet victory; Polish territory split… … Wikipedia
List of Doctor Who universe creatures and aliens — This is a list of fictional creatures and aliens from the universe of the long running BBC science fiction television series Doctor Who, including Torchwood, The Sarah Jane Adventures and K 9. It covers alien races and other fictional creatures,… … Wikipedia
