Viewing topic: Retraction

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  • Definition: If A is a subset of X, a retraction of X onto A is a continuous map r: X -> A such that r|A is the identity map of A. If such a map r exists, we say that A is a retract of X.

    Source: Topology (second edition) by James R. Munkres

  • Listed under: Algebraic Topology, Field Of Topology

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