Logical Equivalence, Deduction Theorem, Proof by Refutation, and Inference Rules

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Logical Equivalence, Deduction Theorem, Proof by Refutation, and Inference Rules, Valid Sentence, Satisfiable, Tautologies, Inference Rules, Modus Ponen, And-Elimination, Biconditional Elimination, Contraposition, Implication elimination
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how prove : ¬A ⇒( A ⇒ B) an theorem . with deduction theorem ??

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