Search: MSC category 57N13 ( Topology of $E^4$, $4$-manifolds [See also 14Jxx, 32Jxx] )
 Homotopy Self-Equivalences of 4-manifolds with Free Fundamental Group We calculate the group of homotopy classes of homotopy self-equivalences of $4$-manifolds with free fundamental group and obtain a classification of such $4$-manifolds up to $s$-cobordism. Categories:57N13, 55P10, 57R80