OAI/Analysis/LipschitzHilbert/Estimates/FiniteVariation.lean

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Finite cubic variation and its dimension-free Euclidean comparison.

  1. def OAI.LipschitzHilbert.finiteCubicVariation line 15
  2. theorem OAI.LipschitzHilbert.finiteCubicVariation_nonneg line 22
  3. theorem OAI.LipschitzHilbert.partition_le_finiteCubicVariation line 30
  4. theorem OAI.LipschitzHilbert.scalar_finiteCubicVariation line 40
  5. theorem OAI.LipschitzHilbert.euclidean_partition_variation_le line 74

    Source documentation

    Minkowski in ℓ^(3/2) moves the Euclidean coordinates outside the variation. The constant does not depend on the number of coordinates.

    theorem euclidean_partition_variation_le {κ : Type*} [Fintype κ]
        (F : ℕ → EuclideanSpace ℝ κ) (N : ℕ)
        (p : Fin (N + 1) → Fin (N + 1)) :
        (∑ i : Fin N, ‖F (p i.succ) - F (p i.castSucc)‖ ^ 3) ^ (2 / 3 : ℝ) ≤
          ∑ k, (∑ i : Fin N,
            ‖F (p i.succ) k - F (p i.castSucc) k‖ ^ 3) ^ (2 / 3 : ℝ) := by
    …
  6. theorem OAI.LipschitzHilbert.euclidean_finiteCubicVariation_le line 97