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Logic  /  Logic 152  ·  Atom · ~20 seconds

Denying the Antecedent

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State

If p then q; not-p; therefore not-q. Invalid — always.

Show

If it rained, the street's wet. It didn't rain. "So the street's dry" — the hydrant laughs.

Watch for

MT's evil twin. The conditional never promised q *only* through p.

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