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AN AXIOMATIC THEORY OF WELL-ORDERINGS

Published online by Cambridge University Press:  04 March 2011

OLIVER DEISER
OLIVER DEISER*
Affiliation:
Technische Universität München
*
*TECHNISCHE UNIVERSITÄT MÜNCHEN, SCHOOL OF EDUCATION, SCHELLINGSTR. 33, 80799 MÜNCHEN, GERMANY. E-mail: deiser@tum.de
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Abstract

We introduce a new simple first-order framework for theories whose objects are well-orderings (lists). A system ALT (axiomatic list theory) is presented and shown to be equiconsistent with ZFC (Zermelo Fraenkel Set Theory with the Axiom of Choice). The theory sheds new light on the power set axiom and on Gödel’s axiom of constructibility. In list theory there are strong arguments favoring Gödel’s axiom, while a bare analogon of the set theoretic power set axiom looks artificial. In fact, there is a natural and attractive modification of ALT where every object is constructible and countable. In order to substantiate our foundational interest in lists, we also compare sets and lists from the perspective of finite objects, arguing that lists are, from a certain point of view, conceptually simpler than sets.

Type
Research Article
Information
The Review of Symbolic Logic , Volume 4 , Issue 2 , June 2011 , pp. 186 - 204
Copyright
Copyright © Association for Symbolic Logic 2011

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