Two propositions are logically equivalent if and only if the biconditional...

  • Thread starter Thread starter EEri d
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EEri d

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...composed of them is a tautology.? Is anyone able to answer this question??
Prove this metalogical theorem [use any convincing and coherent method you want] ;

Two propositions are logically equivalent if and only if the biconditional composed of them is a tautology.
 
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