Abstract

AbstractWe define the notion ofordinal computabilityby generalizing standard Turingcomputability on tapes of length ω to computations on tapes of arbitrary ordinal length. We show that a set of ordinals is ordinal computable from a finite set of ordinal parameters if and only if it is an element of Gödel'sconstructible universeL. This characterization can be used to prove the generalized continuum hypothesis inL.

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