Fitch's Paradox and Level-Bridging Principles

Journal of Philosophy 117 (1):5-29 (2020)
Download Edit this record How to cite View on PhilPapers
Fitch’s Paradox shows that if every truth is knowable, then every truth is known. Standard diagnoses identify the factivity/negative infallibility of the knowledge operator and Moorean contradictions as the root source of the result. This paper generalises Fitch’s result to show that such diagnoses are mistaken. In place of factivity/negative infallibility, the weaker assumption of any ‘level-bridging principle’ suffices. A consequence is that the result holds for some logics in which the “Moorean contradiction” commonly thought to underlie the result is in fact consistent. This generalised result improves on the current understanding of Fitch’s result and widens the range of modalities of philosophical interest to which the result might be fruitfully applied. Along the way, we also consider a semantic explanation for Fitch’s result which answers a challenge raised by Kvanvig.
PhilPapers/Archive ID
Upload history
First archival date: 2019-08-31
Latest version: 2 (2019-08-31)
View other versions
Added to PP index

Total views
1,006 ( #5,608 of 69,199 )

Recent downloads (6 months)
122 ( #5,383 of 69,199 )

How can I increase my downloads?

Downloads since first upload
This graph includes both downloads from PhilArchive and clicks on external links on PhilPapers.