One of the Eilenberg-Steenrod axioms which states that, if is a space with subspaces and such that the set closure of is contained in the interior of , then the inclusion map induces an isomorphism .

# Excision Axiom

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## Cite this as:

Weisstein, Eric W. "Excision Axiom." From
*MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/ExcisionAxiom.html