extension map
extension map
[ik′sten·chən ‚map] (mathematics)
An extension map of a map ƒ from a set A to a set L is a map g from a set B to L such that A is a subset of B and the restriction of g to A equals ƒ.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.