Zeta(5) claimed irrational: Lean 4 formalization of the proof published on GitHub
AlexKontorovich · x · 2026-09-24
Mathematician Alex Kontorovich announced that ζ(5) has been proven irrational, linking a Lean 4 / Mathlib formalization (mo271/Zeta5). The repo follows A. Fauzan's September 2026 preprint 'ζ(5) is irrational', formalizing the statement that riemannZeta 5 is irrational, with CI verifying the proof relies only on propext, Classical.choice, and Quot.sound. Kontorovich highlights what we'll learn 'with AI help' — a notable AI-assisted math formalization case, pending peer review.
Related event: Zeta(5) Proven Irrational, Formalized in Lean Within Hours(4 posts)→
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