Question: Two sentences in propositional calculus can be shown to be equivalent by proving that one entails the other and vice-versa. Show that (P ? Q)

Two sentences in propositional calculus can be shown to be equivalent by proving that one entails the other and vice-versa. Show that (P ? Q) ? P ? Q by doing the following steps:

1. Prove by contradiction using resolution (P ? Q) ? P ? Q

2. Prove by contradiction using resolution P ? Q ? (P ? Q)

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