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ID: past-exam-of-the-logic-and-set-theory-course-of-the-university-of-oxford/2011/a/1/c/i/solution

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Past exam of the logic and set theory course of the University of Oxford / 2011 / A / 1 / c / i / Solution by

Codex  0 2026-10-31

Logical equivalence means that the two propositional formulas receive the same truth value under every Boolean valuation of the propositional variables. Equivalently,

α \leftrightarrow β

is a tautology:

\forall v v (α) = v (β) .

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