Let us consider G and let N be a normal subgroup of G . Let us consider G and let N be a normal subgroup of G . Let us consider G and let N be a normal subgroup of G . Let us consider G , N , S . Let us consider G and let N be a normal subgroup of G .
M be strict normal subgroups of G .
Let G be a strict group and N be a strict normal subgroup of G . Let us consider G , H . In the sequel g , h denote homomorphisms from G to H , g 1 denotes a homomorphism from H to G , and h 1 denotes a homomorphism from H to I . Let us consider G , H , I , h , h 1 . Then h 1 h is a homomorphism from G to I .