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twice-punctured sphere

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  • United Kingdom — a kingdom in NW Europe, consisting of Great Britain and Northern Ireland: formerly comprising Great Britain and Ireland 1801 1922. 58,610,182; 94,242 sq. mi. (244,100 sq. km). Cap.: London. Abbr.: U.K. Official name, United Kingdom of Great… …   Universalium

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  • Charles Holland (cyclist) — Charles Holland Personal information Full name Charles Holland Born 20 September 1908(1908 09 20) Aldridge, England, United Kingdom Died 15 December 1989(1989 12 15) (aged 81) …   Wikipedia

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  • Homotopy groups of spheres — In the mathematical field of algebraic topology, the homotopy groups of spheres describe how spheres of various dimensions can wrap around each other. They are examples of topological invariants, which reflect, in algebraic terms, the structure… …   Wikipedia

  • Differential geometry of surfaces — Carl Friedrich Gauss in 1828 In mathematics, the differential geometry of surfaces deals with smooth surfaces with various additional structures, most often, a Riemannian metric. Surfaces have been extensively studied from various perspectives:… …   Wikipedia

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  • All That Fall — is a one act radio play by Samuel Beckett produced following a request [It has been reported that Beckett wrote this play following a commission from the BBC. This is not correct. Hugh Kenner advises that Beckett had written only some of his… …   Wikipedia

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