let K be Ring; :: thesis: for V being LeftMod of K
for W1, W2 being Subspace of V holds W1 /\ W2 c= W1 + W2
let V be LeftMod of K; :: thesis: for W1, W2 being Subspace of V holds W1 /\ W2 c= W1 + W2
let W1, W2 be Subspace of V; :: thesis: W1 /\ W2 c= W1 + W2
W1 /\ W2 is Subspace of W1 + W2 by VECTSP_5:23;
hence W1 /\ W2 c= W1 + W2 by Def7; :: thesis: verum