Abstract
We characterize the bounded first order consequences of theory in U 12 terms of a limited use of exponentiation, we construct a simulation of U 12 by the quantified propositional calculus, and we prove that U 12 is not conservative over IΔ0 and that it is stronger than a conservative Δ 1,b1 -extension of S 2. As corollaries we obtain that U 12 is not conservative over TNC and that ∑ bj -consequences of U 21 are finitely axiomatizable (j ≥ 2). We also show that Ů 12 plus a version of ∏ 1,b1 -SEP is conservative over U 12 (BD) w.r.t. bounded formulas.
On leave from the Mathematical Institute on Prague.
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Krajíček, J., Takeuti, G. (1990). On Bounded ∑ 11 Polynomial Induction. In: Buss, S.R., Scott, P.J. (eds) Feasible Mathematics. Progress in Computer Science and Applied Logic, vol 9. Birkhäuser Boston. https://doi.org/10.1007/978-1-4612-3466-1_15
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DOI: https://doi.org/10.1007/978-1-4612-3466-1_15
Publisher Name: Birkhäuser Boston
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Online ISBN: 978-1-4612-3466-1
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