Definition 10.9.1. Let $R$ be a ring, $S$ a subset of $R$. We say $S$ is a multiplicative subset of $R$ if $1\in S$ and $S$ is closed under multiplication, i.e., $s, s' \in S \Rightarrow ss' \in S$.
Definition 10.9.1. Let $R$ be a ring, $S$ a subset of $R$. We say $S$ is a multiplicative subset of $R$ if $1\in S$ and $S$ is closed under multiplication, i.e., $s, s' \in S \Rightarrow ss' \in S$.
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