Give a formal two-column proof of the statement, using the statements and rules
ID: 3145354 • Letter: G
Question
Give a formal two-column proof of the statement, using the statements
and rules of inference of Propositional Logic.
((P Q) ^ ¬P ) Q
So far I have:
1)Assume ((P Q) ^ ¬P )
2) (P Q) using (and - )
3) ¬P using (and - )
I need to get Q from the (P Q) but I'm not sure how.
Here are the 12 rules:
Explanation / Answer
(P Q) ^ ¬P
= (P ^ ¬P) v (Q ^ ¬P) (Distributive property)
= F v (Q ^ ¬P) (P ^ ¬P is always false)
= Q ^ ¬P (Property of ^)
= Q (Conjunctive simplification).
Another way
(P Q) ^ ¬P
= (¬P -> Q) ^ ¬P (Material implication)
= Q (Modus ponens)
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