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Abstraction Principles and the Classification of Second-Order Equivalence Relations

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Publication:6298696

DOI10.1215/00294527-2018-0023arXiv1803.02472WikidataQ128527579 ScholiaQ128527579MaRDI QIDQ6298696

Author name not available (Why is that?)

Publication date: 6 March 2018

Abstract: This paper improves two existing theorems of interest to neo-logicist philosophers of mathematics. The first is a classification theorem due to Fine for equivalence relations between concepts definable in a well-behaved second-order logic. The improved theorem states that if an equivalence relation E is defined without non-logical vocabulary, then the bicardinal slice of any equivalence class---those equinumerous elements of the equivalence class with equinumerous complements---can have one of only three profiles. The improvements to Fine's theorem allow for an analysis of the well-behaved models had by an abstraction principle, and this in turn leads to an improvement of Walsh and Ebels-Duggan's relative categoricity theorem.





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