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retract∗ rspuzio† 2013-03-21 13:22:05 Let X be a topological space and Y a subspace of X. If there exists a continuous map r : X → Y such that r(y) = y for all y ∈ Y , then we say Y is a retract of X and r is a retraction. ∗ hRetracti created: h2013-03-21i by: hrspuzioi version: h31693i Privacy setting: h1i hDefinitioni h54C15i † This text is available under the Creative Commons Attribution/Share-Alike License 3.0. You can reuse this document or portions thereof only if you do so under terms that are compatible with the CC-BY-SA license. 1