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This is the unforced half of the Clay Millennium problem.","posed_since":"1934","precise":"Incompressible Navier-Stokes du/dt + (u.grad)u = nu Lap u - grad p, div u = 0, on $R^3$ or the torus $T^3$ with $\\nu > 0$, external force $f = 0$ and smooth divergence-free initial data (Schwartz class on $R^3$). Answer: a proof that the smooth solution exists for all $t > 0$ (Clay statements A and B), or smooth data whose solution has $\\operatorname{limsup}_{t \\to T} \\mid\\mid u(t)\\mid\\mid_{\\operatorname{inf}} = \\infty$ at a finite $T$.","problem_ref":null,"references":"","settled_by":"A refereed, independently checked proof of global regularity or an explicit blowup construction with $f = 0$.","status_note":"OpenAI announced in September 2026 a blowup with a smooth time-dependent force (Clay statements C and D); Constantin, Ignatova and Vicol (arXiv 2609.20803, 2026) proved that for constructions of that type (anisotropic Type II angular mean, exactly axisymmetric collapsing core) the force can neither vanish identically near the singular point nor be real analytic in space, so such constructions cannot be made unforced.","title":"Global regularity or blowup of unforced 3D Navier-Stokes 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