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MTT interpolation at conductor one from depth-one moments

Proved
MTT.interpolation_conductor_one_of_moments

by davidloeffler · Sep 6, 2026 · Mathlib 0df444a (Lean v4.33.1)

modular-formsnumber-theoryp-adic-l-functions

Let ppp be prime, let N>0N>0N>0 and k≥2k\ge 2k≥2, and let fff be a normalized algebraic cuspidal Hecke eigenform of level NNN and weight kkk. Fix compatible complex and ppp-adic embeddings, a period system PPP, an ordinary root α\alphaα, and two signed bounded measures μ+\mu^+μ+ and μ−\mu^-μ− on Zp×\mathbf Z_p^\timesZp×​. Assume each signed measure realizes the prescribed critical polynomial moment on every positive-depth residue disk.

For the primitive character of modulus p0=1p^0=1p0=1 and every 0≤j≤k−20\le j\le k-20≤j≤k−2, there are a continuous function ggg and an algebraic number vvv satisfying the conductor-one interpolation identity

(μ++μ−)(g)=Ep(f,χ,j,α) ιp(v),(\mu^++\mu^-)(g)=E_p(f,\chi,j,\alpha)\,\iota_p(v),(μ++μ−)(g)=Ep​(f,χ,j,α)ιp​(v),

with g(x)=ιp(χ(x))xjg(x)=\iota_p(\chi(x))x^jg(x)=ιp​(χ(x))xj and ι(v)\iota(v)ι(v) equal to the corresponding period-normalized critical value. Both Euler factors in EpE_pEp​ are retained. This is the boundary case recovered by partitioning Zp×\mathbf Z_p^\timesZp×​ into residue disks of depth one and applying the moment relations there.

Preamble
import Definitions.Def_MTT_Measures

set_option autoImplicit false
noncomputable section
open scoped BigOperators
Formal statement
open MTT in
theorem MTT.interpolation_conductor_one_of_moments
    {p N k : ℕ} [Fact p.Prime] (hN : 0 < N) (hk : 2 ≤ k)
    (ι : Qbar →+* ℂ) (ιp : Qbar →+* ℂ_[p]) (f : Eigenform N k ι)
    (P : Periods k ι f.form) (α : ℂ_[p]) (hα : IsOrdinaryRoot f ιp α)
    (μ : Bool → UnitMeasure p)
    (hμ : ∀ s, RealizesMoments f ιp P α s (μ s))
    (χ : DirichletCharacter Qbar (p ^ 0)) (hχ : χ.IsPrimitive)
    (j : ℕ) (hj : j ≤ k - 2) :
    ∃ (g : C((ℤ_[p])ˣ, ℂ_[p])) (v : Qbar),
      (∀ x, g x = specialFunction ιp 0 χ j x) ∧
      ι v = normalizedCriticalValue f P.omega 0 χ j ∧
      (μ true + μ false) g = eulerMultiplier f ιp α 0 χ j * ιp v := by sorry
Source
Mazur–Tate–Teitelbaum, On p-adic analogues of the conjectures of Birch and Swinnerton-Dyer, Invent. Math. 84 (1986), https://doi.org/10.1007/BF01388731; Chapter I, §14 Proposition, pp. 20–21, conductor-one case, using (8.6) and (10.2).

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