Abstract
We define the notion of ordinal computability by generalizing standard TURING computability on tapes of length ω to computations on tapes of arbitrary ordinal length. The generalized TURING machine is able to compute a recursive bounded truth predicate on the ordinals. The class of sets of ordinals which can be read off the truth predicate satisfies a natural theory SO. SO is the theory of the sets of ordinals in a model of the Zeremelo-Fraenkel axioms ZFC. Hence a set of ordinals is ordinal computable from ordinal parameters if and only if it is an element of GÖDEL’s constructible universe L.
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Koepke, P. (2005). Computing a Model of Set Theory. In: Cooper, S.B., Löwe, B., Torenvliet, L. (eds) New Computational Paradigms. CiE 2005. Lecture Notes in Computer Science, vol 3526. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11494645_28
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DOI: https://doi.org/10.1007/11494645_28
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-26179-7
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