Suppose A is a formula of TFL(truth-functional Logic) and B is a proper prefix of it (i.e.,

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Suppose A is a formula of TFL(truth-functional Logic) and B is a proper prefix of it (i.e., an expression/sequence of symbols of the vocabulary of TFL where the ith symbol of B and the ith symbol of A agree, but A is longer than B). Show that B is not a formula. Use induction on A.

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Suppose A is a formula of TFL(truth-functional Logic) and B is a proper prefix of it (i.e.,

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