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regular covering

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  • Covering space — A covering map satisfies the local triviality condition. Intuitively, such maps locally project a stack of pancakes above an open region, U, onto U. In mathematics, more specifically algebraic topology, a covering map is a continuous surjective… …   Wikipedia

  • Covering graph — In the mathematical discipline of graph theory, a graph C is a covering graph of another graph G if there is a covering map from the vertex set of C to the vertex set of G. A covering map f is a surjection and a local isomorphism: the… …   Wikipedia

  • Covering lemma — See also: Jensen s covering theorem In mathematics, under various anti large cardinal assumptions, one can prove the existence of the canonical inner model, called the Core Model, that is, in a sense, maximal and approximates the structure of V.… …   Wikipedia

  • Covering set — In mathematics, a covering set for a sequence of integers refers to a set of prime numbers such that every term in the sequence is divisible by at least one member of the set. The term covering set is used only in conjunction with sequences… …   Wikipedia

  • Newcastle Covering Force — The Newcastle Covering Force was a militia force responsible for protecting Newcastle, Australia and approaches during World War II which was formed on 8 April 1941. The unit was responsible for defending the important port and air bases in and… …   Wikipedia

  • Free regular set — In mathematics, a free regular set is a subset of a topological space that is acted upon disjointly under a given group action. To be more precise, let X be a topological space. Let G be a group of homeomorphisms from X to X. Then we say that the …   Wikipedia

  • Group action — This article is about the mathematical concept. For the sociology term, see group action (sociology). Given an equilateral triangle, the counterclockwise rotation by 120° around the center of the triangle acts on the set of vertices of the… …   Wikipedia

  • Principal bundle — In mathematics, a principal bundle is a mathematical object which formalizes some of the essential features of a Cartesian product X times; G of a space X with a group G . Analogous to the Cartesian product, a principal bundle P is equipped with… …   Wikipedia

  • S.H.E — Infobox Chinese language singer and actor name = S.H.E caption = Hebe, Ella, and Selina (from left to right) in Hong Kong during their Perfect 3 tour. othername = 女朋友 (CJKV|p=nǚ péngyŏu|l=Girl Friends) occupation = Singers, actresses genre =… …   Wikipedia

  • Papahanaumoku — (literally, broad place who gives birth to islands ), or Pāpā, is the name of the Kanaka Maoli creatrix goddess in Hawaiian mythology. Together with her husband Wakea ( sky father ) Pāpā is the ancestor of all people and Kalo, and mother of… …   Wikipedia

  • United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …   Universalium

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