Theorem Subgroup.commutator_le_sup

Modification history

2026-05-25 14:15
Mathlib/GroupTheory/Commutator/Basic.lean
feat(GroupTheory/Commutator/Basic): `⁅H₁, H₂⁆` is a normal subgroup of `H₁ ⊔ H₂` (#39227) …
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