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International Studies in Phenomenology and Philosophy

Series | Book | Chapter

192028

Takeuti's well-ordering proof

finitistically fine?

Eamon Darnell Aaron Thomas-Bolduc

pp. 167-180

Abstract

If one of Gentzen's consistency proofs for pure number theory could be shown to be finitistically acceptable, an important part of Hilbert's program would be vindicated. This paper focuses on whether the transfinite induction on ordinal notations needed for Gentzen's second proof can be finitistically justified. In particular, the focus is on Takeuti's purportedly finitistically acceptable proof of the well ordering of ordinal notations in Cantor normal form.The paper begins with a historically informed discussion of finitism and its limits, before introducing Gentzen and Takeuti's respective proofs. The rest of the paper is dedicated to investigating the finitistic acceptability of Takeuti's proof, including a small but important fix to that proof. That discussion strongly suggests that there is a philosophically interesting finitist standpoint that Takeuti's proof, and therefore Gentzen's proof, conforms to.

Publication details

Published in:

Zack Maria, Schlimm Dirk (2018) Research in history and philosophy of mathematics: the CSHPM 2017 annual meeting in Toronto, Ontario. Basel, Birkhäuser.

Pages: 167-180

DOI: 10.1007/978-3-319-90983-7_11

Full citation:

Darnell Eamon, Thomas-Bolduc Aaron (2018) „Takeuti's well-ordering proof: finitistically fine?“, In: M. Zack & D. Schlimm (eds.), Research in history and philosophy of mathematics, Basel, Birkhäuser, 167–180.