Equivalence (biconditional, ) is a logical connective representing “if and only if,” returning true when both operands have the same truth value. Biconditionals express mutual implication and are essential for definitions in mathematics, where a property is defined as holding exactly when certain conditions are met.
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Fact-Check Notes
No factual issues found; the truth-table description (true iff both operands share the same truth value: T,T→T; T,F→F; F,T→F; F,F→T) is correct. All links verified as relevant.