retract

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retract

[′rē‚trakt]
(mathematics)
A subset R of a topological space X is a retract of X if there is a continuous map ƒ from X to R, with ƒ(r) = r for all points r of R.
References in periodicals archive ?
Safety features include emergency retractability and power line proximity alerts
Since the commencement of the litigation, Ameron has successfully introduced to market a coaxial product line that does not require retractability.