Definition:Symmetric Set/Real Numbers

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Let $\R$ be the set of real numbers.

Let $S \subseteq \R$ such that:

$\forall x \in S: -x \in S$

That is, for every element in $S$, its negative is also in $S$.

Then $S$ is a symmetric subset of $\R$, or (if $\R$ is implicit) $S$ is a symmetric set.

Also see