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Correctness of the general procedure (round six, `gen_correct`)

Proved
IntMul.Kappa.R6.IL.gen_correct

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

complexity-theoryinteger-multiplicationkappa-improvement

Correctness of the general procedure.

The following holds (Lean statement, in the scope of module Solutions.R6ILGen):

theorem IntMul.Kappa.R6.IL.gen_correct (C : Bit.QHNet (ZMod 2) W T m) (q : ℕ) (ad : IStmt HS 1) (hm : 2 ≤ m)
    (hq : q.Prime) (hqB : qBound C < q) (hOK : ∀ f, C.EdgesOK (q ^ f)) (hruns : C.RunsOK)
    (M Bb : ℕ) (hM : zsz (M : ℤ) ≤ Bb) : ∀ e, GenSpec C q ad M Bb e

Context. Round six, item language: the general procedure and its correctness

genP C q (entry genE, level branch genL C, tail genTail q) is run by tabG C q ad 0 when the descriptor register dJ holds -1 (generic mode, descriptor DescG). gen_correct: by strong induction on the width e, tabG C q ad 0 computes progH C q e at cost costN C q Bb e V.

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_Defs13

set_option autoImplicit false
set_option relaxedAutoImplicit false
set_option maxHeartbeats 1000000

open IntMul IntMul.Kappa IntMul.Kappa.R6 IntMul.Kappa.R6.IL
open IntMul NLogN NLogN.RS NLogN.KIL NLogN.KFD NLogN.KFE AModel AModelL12 Finset
variable {W T m : ℕ} [NeZero W]
Formal statement
theorem IntMul.Kappa.R6.IL.gen_correct (C : Bit.QHNet (ZMod 2) W T m) (q : ℕ) (ad : IStmt HS 1) (hm : 2 ≤ m)
    (hq : q.Prime) (hqB : qBound C < q) (hOK : ∀ f, C.EdgesOK (q ^ f)) (hruns : C.RunsOK)
    (M Bb : ℕ) (hM : zsz (M : ℤ) ≤ Bb) : ∀ e, GenSpec C q ad M Bb e := 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.IL.gen_correct`, Solutions/R6ILGen.lean (lines 185–331) of the round-six development.

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