Set of Words Generates Group/Corollary
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Corollary to Set of Words Generates Group
Let $G$ be a group.
Let $T \subseteq G$.
Let $\map W T$ be the set of words of $T$.
If $T$ is closed under taking inverses, then $\map W T$ is a subgroup of $G$.
Proof
This follows directly from Set of Words Generates Group and the fact that $T$ has the same properties as $\hat S$ in that result.
$\blacksquare$