Differentiate between proposition and wff.
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A proposition is a sentence that is either true or false whereas wff (Well-Formed Formula) is a system of representing a propositional statement or expression in short form.
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Complete the following table:
Show that the given statements are tautologies:
[(p ⇒ q) ^ (q ⇒ r)] ⇒ (p ⇒ r)
[(p ⇒ q) ^ p] ⇒ q