In the expression p ↔ q, what does it mean?

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Understand the Problem

The question is asking about the meaning of the logical expression p ↔ q, and it provides multiple choice options to clarify its interpretation in propositional logic.

Answer

p if and only if q

The expression p ↔ q means 'p if and only if q'.

Answer for screen readers

The expression p ↔ q means 'p if and only if q'.

More Information

In logic, 'p if and only if q' emphasizes that both propositions must simultaneously be true or false.

Tips

Confusing biconditional with implication is common. Remember 'if and only if' for the biconditional.

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