Prove that the stringcannot appear as a substring in any wff.Restrictions. Your proof will be acceptable only if it is either by induction on...
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Prove that the string→→cannot appear as a substring in any wff.Restrictions. Your proof will be acceptable

only if it is either by induction on formulas, or by analysing formula-calculations.


Prove that if we have¬A|=tautB and B|=taut⊥ then we must have |=tautA.

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