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
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What is logically equivalent to the converse? - Quora
SOLVED: statements and Q are elaborate). We will investigate another form of DeMor- gan'laws in Section 2.4. Negation and implication: The statement P = Q is logically equivalent to the statement Q=-P