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neighborhood retract∗
rspuzio†
2013-03-21 17:59:36
Let X be a topological space and Y a subspace of X. If there exists an
open set U such that Y ⊂ U ⊂ X and Y is a retract of U , then we say Y is a
neighborhood retract of X.
∗ hNeighborhoodRetracti created: h2013-03-21i by: hrspuzioi version: h36255i Privacy
setting: h1i hDefinitioni h54A99i
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