Les solutions élements finis des équations de Navier-Stokes périodiques en dimension trois sont « appropriées »

It is shown that the limits of Faedo-Galerkin approximations of the Navier-Stokes equations in the three-dimensional torus are suitable weak solutions to the Navier-Stokes equations provided they are constructed using finite-dimensional spaces having a discrete commutator property and satisfying a proper inf-sup condition. Low order mixed finite element spaces appear to be acceptable for this purpose. This question was open since the notion of suitable solution was introduced. To cite this article: J.-L. Guermond, C. R. Acad. Sci. Paris, Ser. I 341 (2005).