Sharp Refinements to Appendix C of OpenAI's Finite Time Blowup for Navier–Stokes: Explicit Variance Selection, Sharp Second-Order Moment Asymptotics, and Internal Exact Restoration
This research note gives three sharp refinements to Appendix C, “Realizing the admissible stress cone,” of OpenAI’s 2026 preprint Finite Time Blowup for Navier–Stokes. First, the implicit scalar variance-selection step in Lemma C.1 is replaced by an algebraic Poisson-kernel parameterization. The associated upper admiss...