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Prove the case involving ?E of the inductive step of the (strong) soundness theorem for natural...

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Advance Math

Prove the case involving ?E of the inductive step of the(strong) soundness theorem for natural deduction in classicalpropositional logic.

Hint: you need to simultaneously consider 3 di?erent instancesof entailment, 1 regular and 2 featuring the transformation of anassumption into a premise.

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