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Scalar multiplication in a module over a ring must satisfy three main axioms: the identity axiom ($1m=m$), the associativity axiom ($(r_1r_2)m=r_1(r_2m)$), and the distributive laws ($r(m+m')=rm+rm'$ and $(r+r')m=rm+r'm$).

Conditions: R is a ring.; M is an abelian group under addition.; The scalar multiplication map $\mu : R \times M \to M$ is defined.

Scalar multiplication in a module over a ring must satisfy three main axioms: the identity axiom ($1m=m$), the associativity axiom ($(r_1r_2)m=r_1(r_2m)$), and the distributive laws ($r(m+m')=rm+rm'$ and $(r+r')m=rm+r'm$).

Conditions: R is a ring.; M is an abelian group under addition.; The scalar multiplication map $\mu : R \times M \to M$ is defined.