Question: 2. Let A be a ring, a an ideal, M an A-module. Show that (A/a) &A M is isomor- phic to MaM. [Tensor the exact

2. Let A be a ring, a an ideal, M an A-module. Show that (A/a) &A M is isomor- phic to MaM. [Tensor the exact sequence 0 -> a -> A - A/a -> 0 with M.]

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