1 nbspallow s and t to be logical expressions nbspuse the


1.  Allow s and t to be logical expressions.  Use the principle of duality and Laws of Logic in order to prove that s ⇒ t if and only if t^d ⇒ s^d.

2.  Show that if p1 ∧ p2 ∧ p3 ⇐⇒ p1 ∧ p2 ∧ p3 ∧ r then it also means that (p1 ∧ p2 ∧ p3) ⇒ r.

 

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Mathematics: 1 nbspallow s and t to be logical expressions nbspuse the
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