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DOI: 10.4230/LIPIcs.ITP.2023.36

Fermat’s Last Theorem for Regular Primes (Short Paper)

Authors: Alex J. Best, Christopher Birkbeck, Riccardo Brasca, and Eric Rodriguez Boidi

Published in: LIPIcs, Volume 268, 14th International Conference on Interactive Theorem Proving (ITP 2023)

Abstract

We formalise the proof of the first case of Fermat’s Last Theorem for regular primes using the Lean theorem prover and its mathematical library mathlib. This is an important 19th century result that motivated the development of modern algebraic number theory. Besides explaining the mathematics behind this result, we analyze in this paper the difficulties we faced in the formalisation process and how we solved them. For example, we had to deal with a diamond about characteristic zero fields and problems arising from multiple nested coercions related to number fields. We also explain how we integrated our work to mathlib.

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Alex J. Best, Christopher Birkbeck, Riccardo Brasca, and Eric Rodriguez Boidi. Fermat’s Last Theorem for Regular Primes (Short Paper). In 14th International Conference on Interactive Theorem Proving (ITP 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 268, pp. 36:1-36:8, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{best_et_al:LIPIcs.ITP.2023.36,
  author =	{Best, Alex J. and Birkbeck, Christopher and Brasca, Riccardo and Rodriguez Boidi, Eric},
  title =	{{Fermat’s Last Theorem for Regular Primes}},
  booktitle =	{14th International Conference on Interactive Theorem Proving (ITP 2023)},
  pages =	{36:1--36:8},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-284-6},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{268},
  editor =	{Naumowicz, Adam and Thiemann, Ren\'{e}},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ITP.2023.36},
  URN =		{urn:nbn:de:0030-drops-184115},
  doi =		{10.4230/LIPIcs.ITP.2023.36},
  annote =	{Keywords: Fermat’s Last Theorem, Cyclotomic fields, Interactive theorem proving, Lean}
}

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Fermat’s Last Theorem for Regular Primes (Short Paper)

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