feat: add Brauer-Fowler theorem eval problem#310
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This PR adds the Brauer-Fowler theorem (1955): the order of a finite nonabelian simple group is bounded by a function of the order of any involution centralizer. A foundational organising principle of the CFSG programme, reducing the classification (in principle) to the analysis of involution centralizers. Statement uses only Mathlib — no new definitions. 🤖 Prepared with Claude Code
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This PR adds the Brauer-Fowler theorem (1955): the order of a finite nonabelian simple group is bounded by a function of the order of any involution centralizer. A foundational organising principle of the CFSG programme, reducing the classification (in principle) to the analysis of involution centralizers — the strategy used by Brauer-Suzuki, Brauer-Suzuki-Wall, Janko, and many others to identify sporadic simple groups.
Statement uses only Mathlib (
IsSimpleGroup,Nat.card,Subgroup.centralizer,orderOf) — no new definitions.🤖 Prepared with Claude Code