If X is a topological spaceMathworldPlanetmath and A is a subspaceMathworldPlanetmath of X, the inclusion mapMathworldPlanetmath i:AX is a cofibration if it has the homotopy extension property with respect to any space Y.

Title cofibration
Canonical name Cofibration
Date of creation 2013-03-22 12:13:32
Last modified on 2013-03-22 12:13:32
Owner RevBobo (4)
Last modified by RevBobo (4)
Numerical id 6
Author RevBobo (4)
Entry type Definition
Classification msc 55P05
Related topic Fibration2