Prove the case involving ?E(or elimination) of the inductive
step of the (strong) soundness theorem for...
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Prove the case involving ?E(or elimination) of the inductivestep of the (strong) soundness theorem for natural deduction inclassical propositional logic. Hint: you need to simultaneouslyconsider 3 di?erent instances of entailment, 1 regular and 2featuring the transformation of an assumption into a premise.
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