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Strict-capacity weighted bounded representatives

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OAI.PiExponent.LogarithmicJetIdeals.strict_capacity_bounded_representatives

by polylog · Oct 20, 2026 · Mathlib 0df444a (Lean v4.33.1)

number-theoryopenai-pi-exponent-017

Let ddd be admissible fixed determinant data with m=d.mm=d.mm=d.m logarithmic jet directions, let R<SR<SR<S be real scales, let ei>0e_i>0ei​>0 be multiplicities and TiT_iTi​ truncation orders for the logarithmic jet coordinates. Assume the common-scale identity S=ei wirowS = e_i\,w^{\mathrm{row}}_iS=ei​wirow​ for all iii, the strict capacity inequality 2Rm+1>Sm+12R^{m+1}>S^{m+1}2Rm+1>Sm+1, and the strict log-cutoff inequality wi+1row<Ti v0w^{\mathrm{row}}_{i+1}<T_i\,v_0wi+1row​<Ti​v0​. Write III for the simultaneous logarithmic jet ideal at the rational centres and W\mathcal WW for the column weights of the ambient interpolation matrix.

Then there are a representative slope ρ\rhoρ with 0<ρ<R0<\rho<R0<ρ<R and an additive overhead B≥0B\ge 0B≥0 such that for every k≥1k\ge 1k≥1 and every polynomial P∈C[x0,…,xm]P\in\mathbb{C}[x_0,\dots,x_m]P∈C[x0​,…,xm​] there is a polynomial QQQ satisfying

P−Q∈Ikand∑jWj deg⁡j(Q)≤k ρ+B,P-Q \in I^k \qquad\text{and}\qquad \sum_j \mathcal W_j\,\deg_j(Q) \le k\,\rho + B ,P−Q∈Ikandj∑​Wj​degj​(Q)≤kρ+B,

where deg⁡j(Q)\deg_j(Q)degj​(Q) is the exponent of xjx_jxj​ in a monomial of the support of QQQ (the inequality is required for every monomial in the support).

This is the weighted bounded-representative statement with strict capacity: it says that classes modulo the kkk-th power of the simultaneous jet ideal have representatives whose column-weighted size grows at most linearly in kkk with slope strictly below the scale RRR, uniformly in the polynomial and in kkk up to a constant overhead. It is the analytic heart of the strict-capacity pillar: the capacity inequality 2Rm+1>Sm+12R^{m+1}>S^{m+1}2Rm+1>Sm+1 is exactly the statement that the volume of the column-weight simplex of slope RRR exceeds (twice) the volume of the row-weight simplex of height SSS, which is what provides the necessary room for the representative. Together with the elementary construction converting bounded representatives into monic weighted relations, it implies the strict-capacity weighted monic relations statement.

Preamble
import Definitions.Def_OAI_PiExponent_ApproximationDefinitions
import Definitions.Def_OAI_NumberTheory_PiExponent_Approximation_DeterminantContradiction_CoreData
import Definitions.Def_OAI_PiExponent_AdmissibleFormalInterpolation
import Definitions.Def_OAI_PiExponent_PolynomialLogarithmicJets
import Mathlib.RingTheory.MvPolynomial.MonomialOrder

open OAI.PiExponent OAI.PiExponent.DeterminantContradiction
open OAI.PiExponent.AdmissibleFormalInterpolation
open OAI.PiExponent.LogarithmicJetIdeals
open scoped BigOperators
Formal statement
theorem OAI.PiExponent.LogarithmicJetIdeals.strict_capacity_bounded_representatives
    {nu : ℝ} (d : FixedData nu) (R S : ℝ)
    (e : Fin (d.m + 1) → ℕ) (T : Fin d.m → ℕ)
    (hR : 0 < R) (hRS : R < S)
    (he : ∀ i, 0 < e i)
    (hcommon : ∀ i, S = (e i : ℝ) *
      InterpolationMatrix.rowWeights d.v0 d.base.theta
        (MatrixArithmetic.logWeights (finiteDenominators d)) i)
    (hcapacity : 2 * R ^ (d.m + 1 : ℕ) > S ^ (d.m + 1 : ℕ))
    (hT : ∀ i, InterpolationMatrix.rowWeights d.v0 d.base.theta
        (MatrixArithmetic.logWeights (finiteDenominators d)) i.succ <
      (T i : ℝ) * (d.v0 : ℝ)) :
    ∃ (rho B : ℝ), 0 < rho ∧ rho < R ∧ 0 ≤ B ∧
      ∀ k : ℕ, 0 < k → ∀ P : MvPolynomial (Fin (d.m + 1)) ℂ,
        ∃ Q : MvPolynomial (Fin (d.m + 1)) ℂ,
          P - Q ∈ (simultaneousJetIdeal d.K
            (MatrixArithmetic.rationalCenters (finiteNumerators d)
              (finiteDenominators d)) T e) ^ k ∧
          (∀ u ∈ Q.support,
            (∑ j, InterpolationMatrix.columnWeights d.w0
                  (MatrixArithmetic.logWeights (finiteDenominators d)) j *
                (u j : ℝ)) ≤ (k : ℝ) * rho + B) := by
  sorry
Source
Reduction obligation isolated from OAI.PiExponent.LogarithmicJetIdeals.strict_capacity_weighted_monic_relations (OpenAI/math adc7f124, Approximation/AdmissibleMatrixGeometry and Jets/AdmissibleJetPackets pillar).

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