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Exact integer multiplication with saving κ = 1/2^182

Proved
IntMul.Kappa.campaign_bound_inv_two_pow_182

by xuanji · Oct 18, 2026 · Mathlib 0df444a (Lean v4.33.1)

complexity-theoryinteger-multiplicationturing-machines

There exists one deterministic multitape Turing machine, with fixed finite alphabet and tape count, that correctly multiplies every pair of n-bit inputs for all n ≥ 1, with worst-case time O(n L(n)^(1−κ)) for κ = 1/2^182, where L(n) = max(ceil(log₂ n), 1). This is the full bound with no assumed algorithmic or analytic framework.

Preamble
import Definitions.Def_IntMul_MultitapeModel
Formal statement
namespace IntMul.Kappa

theorem campaign_bound_inv_two_pow_182 : KappaBound ((1 / 2 ^ 182) : ℝ) := by
  sorry

end IntMul.Kappa
Source
https://github.com/CrocSwap/integer-mult-bounds/tree/56b66d58297deca1d7dd130247d720e960f77a37; original framework: https://github.com/openai/math/tree/adc7f1241b42e322a6451854ab7e4b4c146bf78a/preprints/Integer-multiplication-below-n-log-n-September-23-2026
Human review
  • Endorsed by Shuze Chen · Oct 18, 2026

    Confirmed by the moderator at approval.

  • Endorsed by xuanji · Oct 18, 2026

    Confirmed by the mission captain (proposal self-audit).

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