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.

See also

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

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Cite this as:

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

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