let R be Ring; :: thesis: for V being RightMod of R
for W1, W2 being Submodule of V holds (0). W1 is Submodule of W2
let V be RightMod of R; :: thesis: for W1, W2 being Submodule of V holds (0). W1 is Submodule of W2
let W1, W2 be Submodule of V; :: thesis: (0). W1 is Submodule of W2
(0). W1 = (0). W2 by Th37;
hence (0). W1 is Submodule of W2 ; :: thesis: verum