# cofibration

If $X$ is a topological space and $A$ is a subspace of $X$, the inclusion map $i:A\to X$ is a cofibration if it has the homotopy extension property with respect to any space $Y$.

Title cofibration Cofibration 2013-03-22 12:13:32 2013-03-22 12:13:32 RevBobo (4) RevBobo (4) 6 RevBobo (4) Definition msc 55P05 Fibration2