OAI/Topology/ArtinGroups/ParabolicIntersections/DynamicsUnconditional.lean

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Paper 082-03, Corollary 1.3, without published hypotheses

For a finite-rank irreducible Artin group whose defining graph is not a clique, the group is acylindrically hyperbolic and every proper parabolic subgroup is weakly malnormal. The acylindrical action is constructed from the genuine visual tree; the algebraic intersection theorem supplies a segment with trivial stabilizer. All metric, boundary, and malnormality arguments are proved in the imported development.

  1. theorem OAI.HarmonicArtin.ParabolicIntersections.unconditional_nonclique_dynamics line 20

    Source documentation

    The full third main result of Parabolic intersections in Artin groups.

    Distinct definitions of this name: ComparatorChallenges/ArtinParabolicIntersections.lean:121 (different declaration text). Qualify references as OAI.HarmonicArtin.ParabolicIntersections.unconditional_nonclique_dynamics@path.

    theorem unconditional_nonclique_dynamics
        (hIrred : IsIrreducible M) (hInf : ∃ s t : S,s≠t ∧ M s t=0) :
        AcylindricallyHyperbolic (Artin M) ∧
          ∀ P : Subgroup (Artin M),IsParabolic M P → P≠⊤ → WeaklyMalnormal P := by
    …

    Mentions: OAI.HarmonicArtin.ParabolicIntersections.IsIrreducible, OAI.HarmonicArtin.ParabolicIntersections.AcylindricallyHyperbolic, OAI.HarmonicArtin.Artin, OAI.HarmonicArtin.ParabolicIntersections.IsParabolic, OAI.HarmonicArtin.ParabolicIntersections.WeaklyMalnormal