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Geometric Programs for Solenoidal Forcing

OpenAI · September 27, 2026

Lean

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Abstract

We construct smooth solenoidal mean-zero forces, periodic from time zero, for which a fixed particle on a flat three-torus reaches a fixed open strip exactly when a given machine halts. The initial fluid velocity and the pressure are zero. We also realize positive diagonal maps on coding sheets by incompressible shears, with explicit normal compensation for changes of planar area, and reciprocal maps on whole boxes of positive thickness. Complete local inverses, initialization rules, and intermediate trajectory bounds connect these geometric constructions to finite computations.

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work in progress

Collected automatically by AI tools (Claude Opus 5.5 and GPT-6 Astra, 2026-10-23) and not checked by a person. May be wrong or incomplete. Report an error.

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  • Riley Scott Jacob (@RilScoJa), post on X (8 Oct 2026). Noting the released proofs give "no worked example", reports building one with Claude Opus 5.5: a smooth 3D flow from rest carrying a fluid particle through a shift-and-add multiplier computing 13 × 11 = 143. [family-level] [AI-generated per source]

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Cite

@misc{OAI:Geometric-Programs-for-Solenoidal-Forcing-September-27-2026,
  author = {{OpenAI}},
  title = {{Geometric Programs for Solenoidal Forcing}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/Geometric-Programs-for-Solenoidal-Forcing-September-27-2026/manuscript.pdf}{OAI:Geometric-Programs-for-Solenoidal-Forcing-September-27-2026}},
  year = {2026}
}

Lean formalization

OpenAI provides Lean files for this family: lean/docs/376.md. The Lean statements have not been checked by people against the paper's claims.

Family 376: Universal computation in forced Navier–Stokes flows

Constructs viscous incompressible flows starting from rest on a fixed flat three-dimensional domain that perform universal computation under smooth external forcing. A terminating compiler turns a Turing machine and input into a finite program for the force, so a designated particle reaches a fixed region exactly when the machine halts. The viscosity is fixed, positive and computable.

Other papers in this family: