Originally Posted by
mathbeginner (a) Let S : U -> V and T : V -> W be linear maps. Show that Ker(TS) =S^-1(Ker T).
(b) Let S : V -> W be a surjective linear map and M a subspace of W. Show that V/S^-1(M)Isomorphisms W/M.
Hint: Apply part (a) to S : V-> W and Q : W ->W/M.