Abstract
We consider the problem of finding the restrictions on the domain Ω⊂R n,n=2,3, under which the space of the solenoidal vector fields from coincides with the space, the closure in W 12 (Ω) of the set of all solenoidal vectors from. We give domains Ω⊂Rn, for which the factor space has a finite nonzero dimension. A similar problem is considered for the spaces of solenoidal vectors with a finite Dirichlet integral. Based on this, one compares two generalized formulations of boundary-value problems for the Stokes and Navier-Stokes systems. The following auxiliary problems are studied:,.
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