In functional analysis and related areas of mathematics a Brauner space is a complete compactly generated locally convex space having a sequence of compact sets such that every other compact set is contained in some .
Brauner spaces are named after Kalman George Brauner, who began their study.[1] All Brauner spaces are stereotype and are in the stereotype duality relations with Fréchet spaces:[2][3]
- for any Fréchet space its stereotype dual space[4] is a Brauner space,
- and vice versa, for any Brauner space its stereotype dual space is a Fréchet space.
Special cases of Brauner spaces are Smith spaces.
Examples
- Let be a -compact locally compact topological space, and the Fréchet space of all continuous functions on (with values in or ), endowed with the usual topology of uniform convergence on compact sets in . The dual space of Radon measures with compact support on with the topology of uniform convergence on compact sets in is a Brauner space.
- Let be a smooth manifold, and the Fréchet space of all smooth functions on (with values in or ), endowed with the usual topology of uniform convergence with each derivative on compact sets in . The dual space of distributions with compact support in with the topology of uniform convergence on bounded sets in is a Brauner space.
- Let be a Stein manifold and the Fréchet space of all holomorphic functions on with the usual topology of uniform convergence on compact sets in . The dual space of analytic functionals on with the topology of uniform convergence on bounded sets in is a Brauner space.
In the special case when possesses a structure of a topological group the spaces , , become natural examples of stereotype group algebras.
- Let be a complex affine algebraic variety. The space of polynomials (or regular functions) on , being endowed with the strongest locally convex topology, becomes a Brauner space. Its stereotype dual space (of currents on ) is a Fréchet space. In the special case when is an affine algebraic group, becomes an example of a stereotype group algebra.
- Let be a compactly generated Stein group.[5] The space of all holomorphic functions of exponential type on is a Brauner space with respect to a natural topology.[6]
See also
Notes
- ^ Brauner 1973.
- ^ Akbarov 2003, p. 220.
- ^ Akbarov 2009, p. 466.
- ^ The stereotype dual space to a locally convex space is the space of all linear continuous functionals endowed with the topology of uniform convergence on totally bounded sets in .
- ^ I.e. a Stein manifold which is at the same time a topological group.
- ^ Akbarov 2009, p. 525.
References
- Brauner, K. (1973). "Duals of Fréchet spaces and a generalization of the Banach-Dieudonné theorem". Duke Mathematical Journal. 40 (4): 845–855. doi:10.1215/S0012-7094-73-04078-7.
- Akbarov, S.S. (2003). "Pontryagin duality in the theory of topological vector spaces and in topological algebra". Journal of Mathematical Sciences. 113 (2): 179–349. doi:10.1023/A:1020929201133. S2CID 115297067.
- Akbarov, S.S. (2009). "Holomorphic functions of exponential type and duality for Stein groups with algebraic connected component of identity". Journal of Mathematical Sciences. 162 (4): 459–586. arXiv:0806.3205. doi:10.1007/s10958-009-9646-1. S2CID 115153766.
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