Restriction map in group cohomology
= Restriction map in group cohomology
Restriction sends a cocycle on $G$ to its restriction to a subgroup $H$. If $H$ is normal, its image in $H^1(H,M)$ is fixed by the induced $G/H$-action.
= Restriction map in group cohomology
Restriction sends a cocycle on $G$ to its restriction to a subgroup $H$. If $H$ is normal, its image in $H^1(H,M)$ is fixed by the induced $G/H$-action.