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B1: `SlabNeed6 P` for every `P.Ok` (round six, `slabNeed6`)

Proved
J6Seg.Src.slabNeed6

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

complexity-theoryinteger-multiplicationkappa-improvement

B1: SlabNeed6 P for every P.Ok.

The following holds (Lean statement, in the scope of module Solutions.J6SegILSrc24):

theorem J6Seg.Src.slabNeed6 (P : Prm) (hP : P.Ok) : SlabNeed6 P

Context. B-line IL, source-table producers, part 24: SlabNeed6 P (B1)

slabNeed6 P hP : SlabNeed6 P for every P.Ok. The family USf dA (8 procedures, uniform in the table): upF dA Z Z1 Cm body{1,3,5,7} and dn0 Cm / dn7 Cm, with parking registers Z, Z1, Cm ∈ {49, 50, 51, 54} \ {dA}. The procedure index map: e1u = 0, e1d = 1, e3u = 2, …, e7d = 7. Constants: Cs = 1, A = 0 (every set-up / tear-down costs ≤ B0 + 2 ≤ cU6 P n 0 / (D+1), via J6Seg.Side.slabCost6_all with K = Kb + 10000).

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_Defs67

set_option autoImplicit false
set_option relaxedAutoImplicit false
set_option maxHeartbeats 1000000

open J6Seg J6Seg.Src
open IntMul NLogN NLogN.KIL Function NLogN.RS J6Seg IntMul.Kappa.R6
open J6Seg.PreT hiding rg RF RF_in RF_out upd_RF_in upd_RF_out cE InRg
open J6Seg.Slab (argO)
open J6Seg.PJ (rg dsc)
open J6Seg.Ax (ρS sZ slabV SetupS Fam SlabNeed6 SlabFree slabV1 slabV3 slabV5 slabV7 ctl1 ctl3 ctl5 ctl7 AxReg)
Formal statement
theorem J6Seg.Src.slabNeed6 (P : Prm) (hP : P.Ok) : SlabNeed6 P := 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 `J6Seg.Src.slabNeed6`, Solutions/J6SegILSrc24.lean (lines 102–160) of the round-six development.

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