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Interpolation of seeded central critical values

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HorizontalPadicL.seededNormalizedThetaMeasure_interpolation

by davidloeffler · Sep 21, 2026 · Mathlib 0df444a (Lean v4.33.1)

modular-formsmodular-symbolsnumber-theoryp-adic-l-functions

Birch's modular-symbol formula identifies nonvanishing of every character evaluation of the normalized theta measure with nonvanishing of the corresponding central critical value. The trivial horizontal character recovers the original seed character.

Deprecated. This statement is false: it asserts interpolation for an arbitrary SeededNormalizedThetaMeasure once its character realization is fixed, although the record contains an unconstrained horizontal measure. Use HorizontalPadicL.seededNormalizedThetaMeasure_exists_with_interpolation (1494c6fa-680a-46c2-b145-46387df6d7c1), which returns the constructed measure and its interpolation proof together.

Preamble
import Definitions.Def_KN_SeededThetaConstruction
import Theorems.Thm_MTT_birch_mellin_formula

set_option autoImplicit false
noncomputable section
Formal statement
namespace HorizontalPadicL

/-- Birch's formula identifies every character evaluation of the normalized
theta measure with the corresponding central critical value. At the trivial
horizontal character this is the original seeded twist by `η`. -/
theorem seededNormalizedThetaMeasure_interpolation
    {N k p B : ℕ} {ι : MTT.Qbar →+* ℂ} [Fact p.Prime]
    (hN : 0 < N) (hk : 2 ≤ k) (heven : Even k)
    (f : MTT.Eigenform N k ι) (hnew : IsNewEigenform f)
    (P : MTT.Periods k ι f.form) (η : DirichletCharacterWithLevel)
    (hηprim : η.2.IsPrimitive) (hηeven : η.2 (-1) = 1)
    (ιp : MTT.Qbar →+* ℂ_[p])
    (L : SeededHorizontalPrimeDataV2 p ιp f η B)
    (characters : SeededHorizontalCharacterRealization L)
    (μ : SeededNormalizedThetaMeasure L)
    (hcharacters : μ.characters = characters) :
    μ.InterpolatesSeededCriticalValues ∧
      (μ.measure.eval (trivialHorizontalCharacterV2 p L.exponent) ≠ 0 ↔
        @MTT.criticalLValue ι f.form
          η.1.1 ⟨Nat.ne_of_gt η.1.2⟩ η.2 (k / 2 - 1) ≠ 0) := by sorry

end HorizontalPadicL
Source
Kriz--Nordentoft, https://arxiv.org/pdf/2310.20678, Corollary 5.4; the formalized MTT Birch--Mellin formula.

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