Correspondence between Abelian Groups and Z-Modules/Isomorphism of Categories

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Let $\Z$ be the ring of integers.

Let $\mathbf{Ab}$ be the category of abelian groups.

Let $\mathbf{\mathbb Z-Mod}$ be the category of unitary $\Z$-modules.

Then the:

are strict inverse functors.

In particular, $\mathbf{Ab}$ and $\mathbf{\mathbb Z-Mod}$ are isomorphic.