Barrelled space

Barrelled space

In functional analysis and related areas of mathematics barrelled spaces are topological vector spaces where every barrelled set in the space is a neighbourhood for the zero vector. A barrelled set or a barrel in a topological vector space is a set which is convex, balanced, absorbing and closed. Barrelled spaces are studied because the Banach-Steinhaus theorem still holds for them.

History

Barrelled spaces were introduced by Bourbaki in an article in Ann. Inst. Fourier , 2 (1950), pp. 5-16.

Examples

* In a semi normed vector space the unit ball is a barrel.
* Every locally convex topological vector space has a neighbourhood basis consisting of barrelled sets.
* Fréchet spaces, and in particular Banach spaces, are barrelled, but generally a normed vector space is "not" barrelled.
* Montel spaces are barrelled
* locally convex spaces which are Baire spaces are barrelled.
* a separated, complete Mackey space is barrelled.

Properties

* A locally convex space X with continuous dual X' is barrelled if and only if it carries the strong topology eta(X, X').

References

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