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A RECONSTRUCTION OF STEEL’S MULTIVERSE PROJECT

Part of: General and miscellaneous specific topics Philosophical aspects of logic and foundations Set theory

Published online by Cambridge University Press:  11 June 2020

PENELOPE MADDY  and
TOBY MEADOWS
PENELOPE MADDY
Affiliation:
DEPARTMENT OF LOGIC AND PHILOSOPHY OF SCIENCE UNIVERSITY OF CALIFORNIA, IRVINEIRVINE, CA, USA E-mail: pjmaddy@uci.edu E-mail: meadowst@uci.edu
TOBY MEADOWS
Affiliation:
DEPARTMENT OF LOGIC AND PHILOSOPHY OF SCIENCE UNIVERSITY OF CALIFORNIA, IRVINEIRVINE, CA, USA E-mail: pjmaddy@uci.edu E-mail: meadowst@uci.edu
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Abstract

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This paper reconstructs Steel’s multiverse project in his ‘Gödel’s program’ (Steel, 2014), first by comparing it to those of Hamkins (2012) and Woodin (2011), then by detailed analysis what’s presented in Steel’s brief text. In particular, we reconstruct his notion of a ‘natural’ theory, describe his multiverse axioms and his translation function, and assess the resulting status of the Continuum Hypothesis. In the end, we reconceptualize the defect that Steel thinks $CH$ might suffer from and isolate what it would take to remove it while working within his framework. As our goal is to present as coherent and compelling a philosophical and mathematical story as we can, we allow ourselves to augment Steel’s story in places (e.g., in the treatment of Amalgamation) and to depart from it in others (e.g., the removal of ‘meaning’ from the account). The relevant mathematics is laid out in the appendices.

Keywords

philosophy of mathematicsfoundations of mathematicsset theorycontinuum hypothesislarge cardinalsforcinggeneric multiverse

MSC classification

Primary: 00A30: Philosophy of mathematics
Secondary: 00A35: Methodology of mathematics, didactics 03A05: Philosophical and critical 03E50: Continuum hypothesis and Martin's axiom 03E55: Large cardinals 03E65: Other hypotheses and axioms
Type
Articles
Information
Bulletin of Symbolic Logic , Volume 26 , Issue 2 , June 2020 , pp. 118 - 169
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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