Equivalence (logical)

of two propositions (formulas) $A$ and $B$

Two propositions $A$ and $B$ are (logically) equivalent if for each admissible choice of values of the parameters of $A$ and $B$ either both are true or both are false. For example, equivalence of equations, inequalities and systems of them means the coincidence of their solution sets. Equivalence of formulas of propositional calculus is the coincidence of the Boolean functions (cf. Boolean function) that they define.

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