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Bounded minimalisation and bounded counting in argument-bounded idc's

Published online by Cambridge University Press:  27 October 2010

MATHIAS BARRA*
Affiliation:
Department of Mathematics, University of Oslo, P.B. 1053, Blindern, 0316 Oslo, Norway Email: georgba@math.uio.no
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Abstract

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We define and investigate a number of small inductively defined classes (idc's), à la Gregorczyk, that are based on argument-bounded initial functions and the bounded minimalisation and bounded counting schemata. We establish equivalences between these and other classes in the literature, with an emphasis on minimalism. We also obtain characterisations of the classes in terms of well-known fragments of first-order predicate logic.