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[–] JesusOfNazareth61 ago 

When U is true, P->U is always true. What are the possibilities for P? When P=0, P->U is true. When P=1, P->U is true.

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[–] eagleshigh [S] ago 

So when it's P > U, whenever the right side of the conditional is true it's always true right. How about (P ^ U) with P-0 and U=?

It would be (0 ^ 1) or (1 ^ 1) right.

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[–] JesusOfNazareth61 ago 

How about (P ^ U) with P-0 and U=? It would be (0 ^ 1) or (1 ^ 1) right.

The emphasized part is wrong because there is no 0 even though P is supposed to be 0.