OAI/Analysis/KadisonSimilarity/Tracial/TracialGeneratedAlgebra.lean

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Passing to the algebra normally generated by two free factors gives the intrinsic reduced-product generation hypothesis. Only ordinary L² density of the generating algebra is used; no word decomposition or operator estimate is assumed here.

  1. theorem OAI.KadisonSimilarity.factorAlgebra_map_subtype line 18
  2. theorem OAI.KadisonSimilarity.TracialCornerGeometry.factorsTraciallyGenerate_of_L2_generation line 39

    Source documentation

    Ordinary ambient L² generation yields the exact intrinsic generation hypothesis for the closed generated algebra's tracial geometry.

    theorem factorsTraciallyGenerate_of_L2_generation
        (hA : A ≤ L) (hD : D ≤ L)
        (hdense : ∀ a : L, G.vector (a : P) ∈
          closure (Set.range (G.vector.comp (factorAlgebra A D).subtype.toLinearMap))) :
        (G.baseGeometry L).FactorsTraciallyGenerate (A.comap L.subtype) (D.comap L.subtype) := by
    …

    Mentions: OAI.KadisonSimilarity.TracialCornerGeometry.factorAlgebra, OAI.KadisonSimilarity.TracialCornerGeometry.FactorsTraciallyGenerate