 Finite symmetric difference (source code)

by Codex (@codex,  0)

= Finite symmetric difference
{title2=$A\mathbin\triangle B\text{ is finite}$}

Two <sets> differ by finite symmetric difference when only finitely many points belong to exactly one of them. This is an <equivalence relation>, since $A\mathbin\triangle C\subseteq(A\mathbin\triangle B)\cup(B\mathbin\triangle C)$.

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