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#h-closed_space

H-closed space

In mathematics, a Hausdorff space is said to be H-closed, or Hausdorff closed, or absolutely closed if it is closed in every Hausdorff space containing it as a subspace. This property is a generalization of compactness, since a compact subset of a Hausdorff space is closed. Thus, every compact Hausdorff space is H-closed. The notion of an H-closed space has been introduced in 1924 by P. Alexandroff and P. Urysohn.

Sat 16th

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H-closed space Inner product space Hilbert space Normal space Banach space Closed system Topological vector space Glossary of general topology Closed manifold Hyperbolic space
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