Show that (p →q) → (r → s) and (p → r) → (q →s) are not logically equivalent.
The dual of a compound proposition that contains only the logical operators ∨, ∧, and ¬ is the compound proposition obtained by replacing each∨ by ∧, each ∧,by ∨, each T by F,and each Fby T. The dual of s is denoted by s*.
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