Definition:Canonical Mapping on Free Module on Set
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Definition
Let $R$ be a ring with unity.
Let $I$ be a set.
Let $R^{\paren I}$ be the free $R$-module on $I$.
The canonical mapping on $R^{\paren I}$ is the mapping $c: I \to R^{\paren I}$ defined as:
- $\forall i \in I: \map c i = e_i$
where $e_i$ is the $i$th canonical basis element of $R^{\paren I}$.