English

On the Closed Graph Theorem and the Open Mapping Theorem

Functional Analysis 2014-11-21 v1 General Topology

Abstract

Let E,FE,F be two topological spaces and u:EFu:E\rightarrow F be a map. \ If FF is Haudorff and uu is continuous, then its graph is closed. \ \ The Closed Graph Theorem establishes the converse when EE and FF are suitable objects of topological algebra, and more specifically topological groups, topological vector spaces (TVS's) or locally vector spaces (LCS's) of a special type. The Open Mapping Theorem, also called the Banach-Schauder theorem, states that under suitable conditions on EE and F,F, if v:FE v:F\rightarrow E is a continuous linear surjective map, it is open. \ When the Open Mapping Theorem holds true for v,v, so does the Closed Graph Theorem for u.u. \ The converse is also valid in most cases, but there are exceptions. \ This point is clarified. Some of the most important versions of the Closed Graph Theorem and of the Open Mapping Theorem are stated without proof but with the detailed reference.

Keywords

Cite

@article{arxiv.1411.5500,
  title  = {On the Closed Graph Theorem and the Open Mapping Theorem},
  author = {Henri Bourlès},
  journal= {arXiv preprint arXiv:1411.5500},
  year   = {2014}
}
R2 v1 2026-06-22T07:05:40.654Z