Breakdown of periodic Navier–Stokes solutions in three dimensions
TheoremDB P9800 · Candidate awaiting source review
Inferred from the community field; finer classification has not been reviewed.
Problem statement
Let be a positive real number. Does there exist a smooth, divergence-free, 1-periodic initial velocity field and a smooth external force that is 1-periodic in space and whose derivatives decay faster than any polynomial in time, such that there is no smooth solution pair to the three-dimensional periodic Navier–Stokes equations with viscosity , initial data , and forcing ? Specifically, no pair exists where and are both smooth, 1-periodic in space for all , satisfy the Navier–Stokes equation
for all and , maintain for all and , and satisfy the initial condition for all .
Lean 4
Formal statement
Lean 4theorem navier_stokes_breakdown_periodic (nu : ℝ) (hnu : nu > 0) :
∃ (u₀ : ℝ³ → ℝ³) (f : ℝ³ → ℝ → ℝ³),
InitialVelocityConditionPeriodic u₀ ∧ ForceConditionPeriodic f ∧
¬ (∃ v p, NavierStokesExistenceAndSmoothnessPeriodic nu u₀ f v p)On-site verification needs an executable Lean target. None is attached yet.
A source attachment or link is not a verified proof. The statement’s correspondence with the original question needs human review.
Proofs & verification
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Progress & source assessment
Source-reported assessment, retrieved 8 September 2026. Frontier Science has not independently reviewed this status.
Open. No signed Lean verification is attached to this problem or its selected resolution.
This record is in the source backlog; its novelty and unresolved status have not passed source review.
Recorded progress
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Discussion
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