Quasi-open map

In topology a branch of mathematics, a quasi-open map or quasi-interior map is a function which has similar properties to continuous maps.

However, continuous maps and quasi-open maps are not related.

[1] A function f : X → Y between topological spaces X and Y is quasi-open if, for any non-empty open set U ⊆ X, the interior of f ('U) in Y is non-empty.

be a map between topological spaces.

This topology-related article is a stub.