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Cost of one table lookup and advance step

Proved
OAI.ThreeMachine.StackCompiler.Costs.tryAdvance

by wurtle · Nov 4, 2026 · Mathlib 0df444a (Lean v4.33.1)

complexityschedulingthree-machine

Throughout, a routine R : Uniform f is a program in the compiler's while-language Code, with a charge function, that computes the function family fif_ifi​ on encoded data. R.time i x is the charge of RRR on the encoding of xxx, a natural number that bounds the number of evaluation steps of the program on that input. For s,f:I→Ns,f:I\to\mathbb{N}s,f:I→N, the predicate Poly s f d means that there is a constant CCC with f(i)≤C (s(i)+2)df(i)\le C\,(s(i)+2)^df(i)≤C(s(i)+2)d for all i∈Ii\in Ii∈I. Let JJJ be an index type with n:J→Nn:J\to\mathbb{N}n:J→N, suppose the lookup tables tabj\mathrm{tab}_jtabj​ have length satisfying Poly n of degree 300003000030000 and contain only small blocks, and that the blocks in the marked states uju_juj​ are small, where BlockSmall b means that the length of bbb and all its time values are at most nnn. The routine Uniform.tryAdvance, which attempts Algorithm.tryAdvance from a marked state using the table, has running time satisfying Poly n of degree 600026000260002.

Formalization Note The statement is reproduced verbatim from upstream SolverCosts.lean (openai/math, Apache-2.0, credit OpenAI). It feeds the bound requestRawBound_poly and the running-time statement of main_theorem.

Preamble
import Mathlib
import Definitions.Def_OAIThreeMachineSched02

set_option maxHeartbeats 2000000
set_option maxRecDepth 100000
set_option linter.all false
set_option Elab.async false

namespace OAI

section
namespace ThreeMachine.StackCompiler.Costs
variable {J : Type} (n : J → ℕ)
variable (U : ∀ j, Universe (n j)) (tab : ∀ j, Table (n j))
variable (u : ∀ j, Algorithm.State (Fin (n j)) × Algorithm.Block (Fin (n j)))
variable (v : ∀ j, Algorithm.State (Fin (n j)))

Formal statement
theorem tryAdvance
    (hl : Poly n (fun j => (tab j).length) 30000)
    (ht : ∀ j, TableSmall (tab j)) (hb : ∀ j, BlockSmall (u j).2) :
    Poly n (fun j => Uniform.tryAdvance.time (n j) (U j,(tab j,(u j,v j)))) 60002 := by
  sorry

end ThreeMachine.StackCompiler.Costs
end
end OAI
Source
OpenAI, "A Polynomial-Time Algorithm for Three-Machine Unit-Job Scheduling" (September 24, 2026), openai/math, cost bounds of the stack compiler. Lean: https://github.com/openai/math/blob/adc7f1241b42e322a6451854ab7e4b4c146bf78a/lean/OAI/Computability/Scheduling/SolverCosts.lean#L77

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