OAI/NumberTheory/Ostmann/Quadratic/QuadraticCompactCutoff.lean

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Exact finite cutoffs for compactly supported quadratic transforms

  1. def OAI.Ostmann.quadraticCompactCutoff line 12
  2. theorem OAI.Ostmann.quadraticCompactCutoff_spec line 15
  3. theorem OAI.Ostmann.quadraticDensityTerm_mem_cutoff line 27
  4. def OAI.Ostmann.positiveQuadraticSum line 47
  5. theorem OAI.Ostmann.positiveQuadraticSum_eq_cutoff line 54

    Source documentation

    Compact support makes the positive quadratic series exactly finite, with one common cutoff for every index in the dyadic segment.

    theorem positiveQuadraticSum_eq_cutoff {q : ℕ} [NeZero q]
        (g : ZMod q → ℂ) (a : ZMod q) (θ : ℝ) (Φ : 𝓢(ℝ, ℂ))
        (R v C : ℝ) (N s : ℕ) (hR : 0 < R) (hv : 0 < v) (hN : 0 < N)
        (hs : N ≤ s) (hΦ : ∀ x : ℝ, C < x → Φ x = 0) :
        positiveQuadraticSum g a θ Φ R v s =
          quadraticDensitySum g (quadraticCompactCutoff q R v C N) a θ Φ R v s := by
    …

    Mentions: OAI.Ostmann.positiveQuadraticSum, OAI.Ostmann.quadraticDensitySum, OAI.Ostmann.quadraticCompactCutoff