Use a truth table to show that 3 q P→ "P is not a tautology. (This example shows that substitution isn't valid for inference rules, in general. Substituting the weaker statement, q, for the stronger statement, p, in the expression "p" doesn't work.) pq →9 P (P→ a) ^ "P ((P→ a) ^ "p) →q ?v ?✓ PEEE PEER T FT ? ? FF ? 24 2 ?~

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