Retraction

A retraction is a continuous map of a space onto a subspace leaving each point of the subspace fixed.

Alternatively, retraction can refer to withdrawal of a paper containing a mistake.

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This entry contributed by Jonathan Sondow (author's link)

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Sondow, Jonathan. "Retraction." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Retraction.html

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