Sphere Theorem

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High Quality Content by WIKIPEDIA articles! In Riemannian geometry, the sphere theorem, also known as the quarter-pinched sphere theorem, strongly restricts the topology of manifolds admitting metrics with a particular curvature bound. The precise statement of the theorem is as follows. If M is a complete, simply-connected, n-dimensional Riemannian manifold with sectional curvature taking values in the interval (1,4] then M is homeomorphic to the n-sphere. (To be precise, we mean the sectional curvature of every tangent 2-plane at each point must lie in (1,4].) Another way of stating the result is that if M is not homeomorphic to the sphere, then it is impossible to put a metric on M with quarter-pinched curvature.

Weitere Informationen

  • Allgemeine Informationen
    • GTIN 09786131192081
    • Editor Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
    • EAN 9786131192081
    • Format Fachbuch
    • Titel Sphere Theorem
    • Herausgeber Betascript Publishing
    • Anzahl Seiten 108
    • Genre Mathematik

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