Basic Results about Unitary Modules

Theorem
Let $\struct {G, +_G}$ be an abelian group whose identity is $e$.

Let $\struct {R, +_R, \times_R}$ be a ring with unity whose zero is $0_R$ and whose unity is $1_R$.

Let $\struct {G, +_G, \circ}_R$ be an unitary $R$-module.

Let $x \in G, n \in \Z$.

Then:

Also see

 * Basic Results about Modules