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The Reason's Proper StudyEssays towards a Neo-Fregean Philosophy of Mathematics$
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Bob Hale and Crispin Wright

Print publication date: 2001

Print ISBN-13: 9780198236399

Published to Oxford Scholarship Online: November 2003

DOI: 10.1093/0198236395.001.0001

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On the Philosophical Significance of Frege's Theorem

On the Philosophical Significance of Frege's Theorem

Chapter:
(p.272) 12 On the Philosophical Significance of Frege's Theorem
Source:
The Reason's Proper Study
Author(s):

Crispin Wright (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/0198236395.003.0013

Frege's theorem is the result that elementary arithmetic may be derived from the second‐ order sentence often referred to as ’Hume's Principle’ (HP). In this essay, Wright considers whether ’abstraction principles’ of this kind can give rise to a distinctively logicist philosophy of mathematics; in particular, he considers whether HP can underpin a satisfactory epistemology of arithmetic. After outlining the neo‐Fregean project as it arises out of Frege's Grundlagen, Wright moves to consider the bad company objection: the distinctive abstractive form of HP is shared by numerous other second‐order sentences, some of which (such as Frege's Basic Law V) are inconsistent. After examining various forms of this challenge and potential responses to them, Wright recommends that the neo‐Fregean restrict attention to those abstraction principles which are conservative. The final sections of the essay survey prospects for extending the neo‐Fregean story to other areas of mathematics.

Keywords:   abstraction principle, Boolos, conservativeness, Dummett, Frege's theorem, Hume's Principle, logicism, mathematics

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