Definition:Support of Module
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Definition
Let $A$ be a commutative ring with unity.
Let $M$ be a unitary $A$-module.
The support $\map \supp M$ of $M$ is the set of prime ideals $P$ of $A$ such that the localization of $M$ at $P$ is nonzero:
- $\map \supp M = \set {P \in \Spec A : M_P \ne 0}$
where $\Spec A$ is the spectrum of $A$.