To prove the this identity -p → (q→r) = q→ (pvr) The following reasoning is valid: ¬p → (q→r)¬¬p v (q→ r) Conditional identity pv (q→ r) Double negation law pv (-q v r) Conditional identity (pv-q) v r Associative law (-q vp) v r Commutative law -qv (p v r) Associative law q→ (p v r) Conditional identity True False

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