Abstract
R. Sherman Lehman has called my attention to an error which vitiates the proofs of two theorems in the paper mentioned in the title (this Journal, vol. 22, pp. 19–35, 113–129). New proofs are here presented.Proof of Lemma, p. 27. Induction Step: Assume as hypothesis of induction that the lemma holds for formulas P with n—1 or fewer free restricted variables and consider a P having n (n>0) such variables.
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