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Partial differential equations (PDEs): Existence and uniqueness, regularity, boundary conditions, linear and non-linear operators, stability, soliton theory, integrable PDEs, conservation laws, qualitative dynamics.

2 votes
2 answers
437 views

2d incompressible Euler equations under periodic boundary conditions

It is well known that the 2d incompressible Navier-Stokes equations under periodic boundary conditions always have global smooth solutions, given smooth initial conditions. I tried searching for a p …
Craig Feinstein's user avatar
4 votes
1 answer
719 views

Heuristic probabilistic argument for the Navier-Stokes existence and smoothness conjecture

The Collatz Conjecture is a famous conjecture that has never been proven; nevertheless, there exists a simple heuristic probabilistic argument which supports its truth - in Wikipedia's words, "If one …
Craig Feinstein's user avatar
3 votes

Heuristic probabilistic argument for the Navier-Stokes existence and smoothness conjecture

The following is the best probabilistic heuristic argument I know, which convinces me that either there is no blow up of the 3D Navier-Stokes equations for any initial data, or a blow up is very unlik …
Craig Feinstein's user avatar