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Round-six top-level assembly: the κ bound from the round-six interfaces

Proved
IntMul.Kappa.R6.kappa_final6

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

complexity-theoryinteger-multiplicationkappa-improvement

Let κ∈R\kappa\in\mathbb Rκ∈R. Assume the six round-six interfaces hold for every admissible parameter record: SetupNeed6 (the §9.2 setup and sources), CrtNeed6 (Φ\PhiΦ with the E′ CRT reversal), FineNeed6 (fine-bit exposure), LineNeed6 (the line maps), P14Need6 (the uniform Proposition 14) and P18IL6 (Proposition 18 from the uniform Proposition 14). Then for every parameter record PPP with P.OkP.\mathrm{Ok}P.Ok and κ<P.gap\kappa<P.\mathrm{gap}κ<P.gap, if the bit-network histogram satisfies histMoment(bitR6,529,P.τ)<148225616\mathrm{histMoment}(\mathrm{bitR6},529,P.\tau)<148225616histMoment(bitR6,529,P.τ)<148225616, the complex-network histogram satisfies histMoment(cxR6,576,P.σ)<207387136\mathrm{histMoment}(\mathrm{cxR6},576,P.\sigma)<207387136histMoment(cxR6,576,P.σ)<207387136 and 2+576log⁡(histRankSum(cxR6))≤P.C12+576\log(\mathrm{histRankSum}(\mathrm{cxR6}))\le P.C_12+576log(histRankSum(cxR6))≤P.C1​, the bit network statement Bit.BitNetR6MomStmt holds and a complex network interface Cx.Prop8IfaceH 207387136 T 576 cxR6 exists, then IntMul.KappaBound κ holds.

In Lean:

theorem IntMul.Kappa.R6.kappa_final6 (κ : ℝ)
    (hSet : ∀ P : Prm, P.Ok → SetupNeed6 P) (hCrt : ∀ P : Prm, P.Ok → CrtNeed6 P)
    (hFine : ∀ P : Prm, P.Ok → FineNeed6 P) (hLine : ∀ P : Prm, P.Ok → LineNeed6 P)
    (hP14 : ∀ P : Prm, P.Ok → P14Need6 P) (hP18 : ∀ P : Prm, P.Ok → P18IL6 P) :
    ∀ P : Prm, P.Ok → κ < P.gap →
      histMoment Jain.bitR6 529 P.τ < 148225616 →
      histMoment Jain.cxR6 576 P.σ < 207387136 →
      2 + 576 * Real.log (histRankSum Jain.cxR6) ≤ P.C1 →
      Bit.BitNetR6MomStmt →
      (∃ T, ∃ J : Cx.Prop8IfaceH 207387136 T 576 Jain.cxR6, ∃ A, IL3H.GClassH J A) →
      IntMul.KappaBound κ

Formalization Note. Part of the Lean formalization of the round-six κ-improvement (integer-multiplication-kappa campaign, target IntMul.Kappa.jain_round6_framework). The statement is copied verbatim from the Lean development; the platform node carries the same declaration name. Definitions it mentions live in the IntMul_Kappa_R6_Defs* bundles (on top of the published κ bundles IntMul_Kappa_K_Defs*).

Preamble
-- Round-six κ development (integer-multiplication-kappa), generated by skeleton subtraction.

import Definitions.Def_IntMul_Kappa_R6_Defs16
import Definitions.Def_IntMul_Kappa_R6_Defs2
import Definitions.Def_IntMul_Kappa_R6_Defs21

set_option autoImplicit false
set_option relaxedAutoImplicit false
set_option maxHeartbeats 1000000

open IntMul IntMul.Kappa IntMul.Kappa.R6
open Finset IntMul NLogN NLogN.KIL NLogN.KFB NLogN.KFT NLogN.KFU NLogN.RS IntMul.OpenAI.Glue IntMul.OpenAI.RCost NLogN.KFM
Formal statement
theorem IntMul.Kappa.R6.kappa_final6 (κ : ℝ)
    (hSet : ∀ P : Prm, P.Ok → SetupNeed6 P) (hCrt : ∀ P : Prm, P.Ok → CrtNeed6 P)
    (hFine : ∀ P : Prm, P.Ok → FineNeed6 P) (hLine : ∀ P : Prm, P.Ok → LineNeed6 P)
    (hP14 : ∀ P : Prm, P.Ok → P14Need6 P) (hP18 : ∀ P : Prm, P.Ok → P18IL6 P) :
    ∀ P : Prm, P.Ok → κ < P.gap →
      histMoment Jain.bitR6 529 P.τ < 148225616 →
      histMoment Jain.cxR6 576 P.σ < 207387136 →
      2 + 576 * Real.log (histRankSum Jain.cxR6) ≤ P.C1 →
      Bit.BitNetR6MomStmt →
      (∃ T, ∃ J : Cx.Prop8IfaceH 207387136 T 576 Jain.cxR6, ∃ A, IL3H.GClassH J A) →
      IntMul.KappaBound κ := by sorry
Source
S. Jain, round-six networks for the integer-multiplication κ-improvement campaign (https://github.com/Swapnil-jain/integer-mult-kappa, commit 5868dc7) and D. Colkitt, integer-mult-bounds (https://github.com/CrocSwap/integer-mult-bounds); target `IntMul.Kappa.jain_round6_framework`. Lean declaration `IntMul.Kappa.R6.kappa_final6`, Solutions/R6MFinal.lean (lines 165–183) of the round-six development.

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