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Cost of computing the output from an instance

Proved
OAI.ThreeMachine.StackCompiler.Costs.unaryAnswer

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 s,n:J→Ns,n:J\to\mathbb{N}s,n:J→N where nnn satisfies Poly s of degree 111, let GjG_jGj​ be instances on njn_jnj​ jobs with edge list length satisfying Poly s of degree 111, and let djd_jdj​ be optional deadlines whose value (default 000) satisfies Poly s of degree 111. The routine Uniform.unaryAnswer, which first computes the reachability matrix and then the answer, has running time satisfying Poly s of degree 150011150011150011.

Formalization Note The statement is reproduced verbatim from upstream RequestBounds.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} (s n : J → ℕ) (U : ∀ j, Universe (n j)) (M : ∀ j, Matrix (n j))

Formal statement
theorem unaryAnswer (G : ∀ j, Instance (n j)) (d : J → Option ℕ)
    (hn : Poly s n 1) (he : Poly s (fun j => (G j).edges.length) 1)
    (hd : Poly s (fun j => (d j).getD 0) 1) :
    Poly s (fun j => Uniform.unaryAnswer.time (n j) (U j,(G j,d j))) 150011 := 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/RequestBounds.lean#L27

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