Geodesic
Quantifier-Free Induction Schema and the Least Element Principle
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Mathematical logic and algebra, Tome 242 (2003), pp. 59-76

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We consider a quantifier-free induction schema and the least element principle in the language of elementary arithmetic enriched by a free function symbol $f$. Some stronger, iterated versions of these schemata are also considered. We show that the iterated induction schema does not prove the existence of a maximum of $f$ on every finite interval. A similar result is obtained for the noniterated least element principle. At the same time, already the doubly iterated least element principle for quantifier-free formulas proves the existence of a maximum of $f$. We also obtain additional results on the relationships between the two schemata, and outline their connections with the induction schema and the least element principle for decidable relations. 
@article{TM_2003_242_a4,
     author = {L. D. Beklemishev},
     title = {Quantifier-Free {Induction} {Schema} and the {Least} {Element} {Principle}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {59--76},
     publisher = {mathdoc},
     volume = {242},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2003_242_a4/}
}
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L. D. Beklemishev. Quantifier-Free Induction Schema and the Least Element Principle. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Mathematical logic and algebra, Tome 242 (2003), pp. 59-76. http://geodesic.mathdoc.fr/item/TM_2003_242_a4/