 Page "Complete metric space" ¶ 8
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Every and compact * Every topological space X is a dense subspace of a compact space having at most one point more than X, by the Alexandroff one-point compactification. * Every compact metric space is separable. * Every continuous map from a compact space to a Hausdorff space is closed and proper ( i. e., the pre-image of a compact set is compact. * Sequentially compact: Every sequence has a convergent subsequence. * Countably compact: Every countable open cover has a finite subcover. * Limit point compact: Every infinite subset has an accumulation point. Every entire function can be represented as a power series that converges uniformly on compact sets. * Every compact metric space ( or metrizable space ) is separable. * Every locally compact regular space is completely regular, and therefore every locally compact Hausdorff space is Tychonoff. Every Tychonoff cube is compact Hausdorff as a consequence of Tychonoff's theorem. Every continuous function on a compact set is uniformly continuous. Every compact Hausdorff space is also locally compact, and many examples of compact spaces may be found in the article compact space. * Every compact Hausdorff space of weight at most ( see Aleph number ) is the continuous image of ( this does not need the continuum hypothesis, but is less interesting in its absence ). *( BCT2 ) Every locally compact Hausdorff space is a Baire space. Every group has a presentation, and in fact many different presentations ; a presentation is often the most compact way of describing the structure of the group. *( BCT2 ) Every locally compact Hausdorff space is a Baire space. Every H * is very special in structure: it is pure-injective ( also called algebraically compact ), which says more or less that solving equations in H * is relatively straightforward.

Every and metric * Every separable metric space is homeomorphic to a subset of the Hilbert cube. * Every separable metric space is isometric to a subset of the ( non-separable ) Banach space l < sup >∞</ sup > of all bounded real sequences with the supremum norm ; this is known as the Fréchet embedding. * Every separable metric space is isometric to a subset of C (), the separable Banach space of continuous functions → R, with the supremum norm. * Every separable metric space is isometric to a subset of the * Every metric space is Tychonoff ; every pseudometric space is completely regular. Every uniformly continuous function between metric spaces is continuous. *( BCT1 ) Every complete metric space is a Baire space. Every smooth submanifold of R < sup > n </ sup > has an induced Riemannian metric g: the inner product on each tangent space is the restriction of the inner product on R < sup > n </ sup >. *( BCT1 ) Every complete metric space is a Baire space. Every building has a canonical length metric inherited from the geometric realisation obtained by identifying the vertices with an orthonormal basis of a Hilbert space. * Every totally disconnected compact metric space is homeomorphic to a subset of a countable product of discrete spaces. This is really a special case of a more general fact: Every continuous function from a compact space into a metric space is bounded. # Every Riemannian metric on a Riemann surface is Kähler, since the condition for ω to be closed is trivial in 2 ( real ) dimensions. Every hyperkähler manifold M has a 2-sphere of complex structures ( i. e. integrable almost complex structures ) with respect to which the metric is Kähler. Every special uniformly continuous real-valued function defined on the metric space is uniformly approximable by means of Lipschitz functions. * Every totally bounded metric space is bounded. Every compact metric space is totally bounded. Every metric space which is ccc is also separable, but in general a ccc topological space need not be separable. Every locally compact group which is second-countable is metrizable as a topological group ( i. e. can be given a left-invariant metric compatible with the topology ) and complete. Every ( almost ) complex manifold admits a Hermitian metric.

Every and space ** Every vector space has a basis. ** Every infinite game in which is a Borel subset of Baire space is determined. ** Every Tychonoff space has a Stone – Čech compactification. * Theorem Every reflexive normed space is a Banach space. Every Hilbert space X is a Banach space because, by definition, a Hilbert space is complete with respect to the norm associated with its inner product, where a norm and an inner product are said to be associated if for all x ∈ X. * Pseudocompact: Every real-valued continuous function on the space is bounded. Every subset A of the vector space is contained within a smallest convex set ( called the convex hull of A ), namely the intersection of all convex sets containing A. Every point in three-dimensional Euclidean space is determined by three coordinates. Every node on the Freenet network contributes storage space to hold files, and bandwidth that it uses to route requests from its peers. Every space filling curve hits some points multiple times, and does not have a continuous inverse. * Every Lie group is parallelizable, and hence an orientable manifold ( there is a bundle isomorphism between its tangent bundle and the product of itself with the tangent space at the identity ) Every vector space has a basis, and all bases of a vector space have the same number of elements, called the dimension of the vector space. Every normed vector space V sits as a dense subspace inside a Banach space ; this Banach space is essentially uniquely defined by V and is called the completion of V.

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