OAI/GroupTheory/PolycyclicRecognition/Geometry/CartanPolarConeKernel.lean

GitHub source file

10 declarations, 0 contain sorry, 0 declared as axioms

Removing the polar cone vertex without changing the mixed ideal

The polar template uses a closed cone containing zero. The cone quotient must kill the zero generalized weight space to descend the overlapping Cartan factors. Salience and the nonzero generator weights supply this bridge for the same mixed ideal.

  1. theorem OAI.PolycyclicRecognition.closedWeightRay_salient line 23
  2. theorem OAI.PolycyclicRecognition.closedTwoWeightCone_salient line 37
  3. theorem OAI.PolycyclicRecognition.transformedPolarCone_salient line 51
  4. theorem OAI.PolycyclicRecognition.CartanWordModel.coneWordIdeal_eq_of_generator_membership line 76
  5. def OAI.PolycyclicRecognition.CartanWordModel.positiveHeightConePreimage line 85

    Source documentation

    Pullback cone with its zero height functional removed.

    def positiveHeightConePreimage (K : ProperCone ℝ (StrongDual ℝ W)) : Set (H →ₗ[ℝ] ℝ) :=
    …
  6. theorem OAI.PolycyclicRecognition.CartanWordModel.heightConePreimage_add line 90
  7. theorem OAI.PolycyclicRecognition.CartanWordModel.positiveHeightConePreimage_add line 97
  8. theorem OAI.PolycyclicRecognition.CartanWordModel.zero_not_mem_positiveHeightConePreimage line 110
  9. theorem OAI.PolycyclicRecognition.CartanWordModel.coneWordIdeal_positiveHeight_eq line 116

    Source documentation

    Removing the vertex does not remove any of the nonzero generator weights.

    theorem coneWordIdeal_positiveHeight_eq (K : ProperCone ℝ (StrongDual ℝ W)) :
        M.coneWordIdeal (positiveHeightConePreimage T eW K) =
          M.coneWordIdeal (heightConePreimage T eW K) := by
    …

    Mentions: OAI.PolycyclicRecognition.CartanWordModel.positiveHeightConePreimage, OAI.PolycyclicRecognition.CartanWordModel.heightConePreimage

  10. theorem OAI.PolycyclicRecognition.CartanWordModel.zero_genWeightSpace_le_polarConeIdeal line 129

    Source documentation

    The closed polar cone gives the same zero-weight-killing ideal needed to descend the action from the overlapping actual Cartan factors.

    theorem zero_genWeightSpace_le_polarConeIdeal (K : ProperCone ℝ (StrongDual ℝ W))
        (hK : (K : ConvexCone ℝ (StrongDual ℝ W)).Salient) :
        (genWeightSpace (cartanRootIdeal H) (0 : H → ℝ)).toSubmodule ≤
          (M.coneWordIdeal (heightConePreimage T eW K)).toSubmodule := by
    …

    Mentions: OAI.PolycyclicRecognition.cartanRootIdeal, OAI.PolycyclicRecognition.CartanWordModel.heightConePreimage