Locally convex topological vector space information
A vector space with a topology defined by convex open sets
In functional analysis and related areas of mathematics, locally convex topological vector spaces (LCTVS) or locally convex spaces are examples of topological vector spaces (TVS) that generalize normed spaces. They can be defined as topological vector spaces whose topology is generated by translations of balanced, absorbent, convex sets. Alternatively they can be defined as a vector space with a family of seminorms, and a topology can be defined in terms of that family. Although in general such spaces are not necessarily normable, the existence of a convex local base for the zero vector is strong enough for the Hahn–Banach theorem to hold, yielding a sufficiently rich theory of continuous linear functionals.
Fréchet spaces are locally convex spaces that are completely metrizable (with a choice of complete metric). They are generalizations of Banach spaces, which are complete vector spaces with respect to a metric generated by a norm.
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Distortion problem Interpolation spaceLocallyconvextopologicalvectorspace – A vectorspace with a topology defined by convex open sets Modulus and characteristic...
(Dieudonné). Let A and B be non-empty, closed, and convex subsets of a locallyconvextopologicalvectorspace such that rec A ∩ rec B {\displaystyle \operatorname...
Fréchet space: a locallyconvextopologicalvectorspace whose topology can be induced by a complete translation-invariant metric. The space Qp of p-adic...
is Fréchet, meaning that it is a complete, metrizable, locallyconvextopologicalvectorspace (TVS). However, this topology is rather pathological: there...
is one of the principal topological properties that are used to distinguish topologicalspaces. A subset of a topologicalspace X {\displaystyle X} is...
generally in a locallyconvextopologicalvectorspace) is the convex hull of its extreme points. However, this may not be true for convex sets that are...
zero vector. A barrelled set or a barrel in a topologicalvectorspace is a set that is convex, balanced, absorbing, and closed. Barrelled spaces are studied...
products (see Tensor product of Hilbert spaces), but for general Banach spaces or locallyconvextopologicalvectorspaces the theory is notoriously subtle....
usual vectorspace topology of R n , {\displaystyle \mathbb {R} ^{n},} hence ℓ n p {\displaystyle \ell _{n}^{p}} is a locallyconvextopologicalvector space...
A nuclear space is a locallyconvextopologicalvectorspace A {\displaystyle A} such that for every locallyconvextopologicalvectorspace B {\displaystyle...
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generally, every locally convextopologicalvectorspace is locally connected, since each point has a local base of convex (and hence connected) neighborhoods...
mathematics, particularly in functional analysis, a Mackey space is a locallyconvextopologicalvectorspace X such that the topology of X coincides with the Mackey...
topologicalvectorspaces; it dates to a 1935 paper of John von Neumann. This definition has the appealing property that, in a locallyconvexspace endowed...
expressed the idea that a surface is a topologicalspace that is locally like a Euclidean plane. Topologicalspaces were first defined by Felix Hausdorff...