# 9. If A and B are submodules of M prove (a) An B is a submodule...

###### Question:

9. If A and B are submodules of M prove (a) An B is a submodule of M. (b) A + B = {a + bla € A, be B} is a submodule of M. (c) (A + B)/B is isomorphic to A (A B).

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