Interior-preserving collection

From Topospaces
Jump to: navigation, search

Template:Subset collection property

Definition

A collection of subsets of a topological space is termed an interior-preserving collection or a Q-collection if for any point in the topological space, the intersection of all the member subsets containing it, is open.

Relation with other properties

Stronger properties

If the collection comprises open sets, the following properties are stronger:

Related compactness property

The compactness properties related to interior-preserving open covers are: