Is p → q logically equivalent to (~p) → (~q)? - Quora
Anjan Shukla. A set of axioms for the propositional calculus with implication and converse non-implication. Notre Dame journal of formal logic, vol. 6 no. 2 (1965), pp. 123–128. | The Journal of
Converse (logic) - Wikipedia
CSE 311 Foundations of Computing I - ppt download
Solved 5. The converse of an implication (such as A+B) is | Chegg.com
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Give the converse, inverse, and the contrapositive of the following implications. | Exercises Mathematics | Docsity