Parameter Free Induction and Reeection
نویسنده
چکیده
We give a precise characterization of parameter free n and n induction schemata, I ? n and I ? n , in terms of reeection principles. This allows us to show that I ? n+1 is conservative over I ? n w.r.t. boolean combinations of n+1 sentences, for n 1. In particular, we give a positive answer to a question by R. Kaye, whether the provably recursive functions of I ? 2 are exactly the primitive recursive ones. We also obtain sharp results on the strength of bounded number of instances of parameter free induction in terms of iterated reeection.
منابع مشابه
Induction Rules, Reeection Principles, and Provably Recursive Functions
A well-known result of D. Leivant states that, over basic Kalmar elementary arithmetic EA, the induction schema for n formulas is equivalent to the uniform reeection principle for n+1 formulas. We show that fragments of arithmetic axiomatized by various forms of induction rules admit a precise axiomatization in terms of reeection principles as well. Thus, the closure of EA under the induction r...
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تاریخ انتشار 1996