Classification of Finite Simple Groups Formalized in Lean

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Its first-generation proof spans thousands of journal pages, written by about a hundred mathematicians over several decades. Here we present a complete formalization in Lean following the first-generation proof, with every logical step checked by Lean’s kernel. Other contributorsRafael Cabral†, Colin Defant*, Erik Gregory†, Aaron Hill†, Letong Hong◇, Qinheping Hu†, Dustin Jamner†, Albert Jiang†, Tadeusz Jordan†, Andranik Kurghinyan†, Kenny Lau*†, Jonathan Laurent†, David Liang†, Jannis Limperg†, Simon Mahns†, Brian Nugent*, Connor Olson†, Ken Ono*, Eric Paul†, Dhruv Rajan†, Karun Ram†, Charlie Ray†, Ho Chung Siu†, Ashvin A.

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