Synonymer & Oplysninger om | engelsk ord NONCOMPACT

Eksempler på brug af NONCOMPACT i en sætning

• The map c is a Hausdorff compactification if and only if X is a locally compact, noncompact Hausdorff space.
• On noncompact spaces, this is the context of the positive mass theorem proved by Richard Schoen and Shing-Tung Yau in the 1970s, and reproved soon after by Edward Witten with different techniques.
• The 29th dimension is the highest dimension for compact hyperbolic Coxeter polytopes that are bounded by a fundamental polyhedron, and the highest dimension that holds arithmetic discrete groups of reflections with noncompact unbounded fundamental polyhedra.
• For n ≥ 2, the noncompact Lie group Sp(n, 1) of isometries of a quaternionic hermitian form of signature (n,1) is a simple Lie group of real rank 1 that has property (T).
• In the spin-foam formalism, the Barrett–Crane model, which was for a while the most promising state-sum model of 4D Lorentzian quantum gravity, was based on representations of the noncompact groups SO(3,1) or SL(2,C), so the spin foam faces (and hence the spin network edges) were labelled by positive real numbers as opposed to the half-integer labels of SU(2) spin networks.
• Example: the Gieseking manifold is commensurable with the complement of the figure-eight knot; these are both noncompact hyperbolic 3-manifolds of finite volume.
• Huisken and Klaus Ecker made repeated use of the monotonicity result to show that, for a certain class of noncompact graphical hypersurfaces in Euclidean space, the mean curvature flow exists for all positive time and deforms any surface in the class to a self-expanding solution of the mean curvature flow.

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