Frege: Identity Challenges Reflection: A Revisionist View

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Ulrich Pardey (Ruhr-Universität Bochum) Kai F. Wehmeier (University of California, Irvine)

Frege

Identity Challenges Reflection: A Revisionist View

Ulrich Pardey (Ruhr-Universität Bochum), Kai F. Wehmeier (University of California, Irvine)

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English

Oxford University Press
01 May 2025

Philosophy: metaphysics & ontology; Philosophy: logic; History of ideas

The received view of identity takes it to be a binary relation between objects like many others: specifically, identity is thought to be the binary relation every object bears to itself and to no others. As such, it is supposed to play a fundamental role in our conceptual scheme. It is also widely held that Gottlob Frege (1848-1925), after a false start in his Begriffsschrift of 1879, where he proposed that identity is a relation between signs, eventually came round to the now mainstream view, the first paragraph of his celebrated 1892 essay ""On Sense and Reference"" marking the transition. In Frege: Identity Challenges Reflection, Ulrich Pardey and Kai F. Wehmeier show that common wisdom is mistaken on both counts. First, careful exegesis shows that Frege did not repudiate the earlier, sign-based conception of identity in his 1892 essay, but instead defended it; moreover, that conception is in no way refuted by the collection of formal and philosophical objections that have been raised against it in subsequent decades. In particular, the Begriffsschrift theory of identity, far from being incompatible with quantification over objects, in fact affords an elegant, ontologically conservative integration of identity into predicate logic. Second, Pardey and Wehmeier argue that our conceptual scheme is not at all committed to a binary relation that every object bears to itself and only itself. Moreover, the tension between the alleged binarity of the identity relation and the logical impossibility of its ever relating two things, famously pointed out by Wittgenstein in the Tractatus, forms the basis of an argument for the logical incoherence of such a relation.

By: Ulrich Pardey (Ruhr-Universität Bochum), Kai F. Wehmeier (University of California, Irvine)
Imprint: Oxford University Press
Country of Publication: United Kingdom
Dimensions: Height: 243mm, Width: 165mm, Spine: 25mm
Weight: 678g
ISBN: 9780198926528
ISBN 10: 0198926529
Pages: 352
Publication Date: 01 May 2025
Audience: College/higher education , Further / Higher Education
Format: Hardback
Publisher's Status: Active

Ulrich Pardey was awarded a doctorate in philosophy from the University of Frankfurt/Main in 1973. He held professional musician positions in Cologne and Dinslaken. He was appointed as Professor of Logic and Philosophy of Language at Ruhr-Universit:at Bochum in 1998, and has been Emeritus Professor since 2012. Kai F. Wehmeier holds a doctorate in mathematical logic from the University of Münster (1996), and a master's degree in philosophy from Ruhr-Universit:at Bochum (1999). He received post-doctoral appointments in M:unster, Leiden, and T:ubingen, and held faculty positions at the University of California, Irvine (2002). He is currently Dean's Professor of Logic and Philosophy of Science and Professor of Language Science at the University of California, Irvine.