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An elementary approach to the 3D Navier-Stokes equations with
Navier
boundary conditions: Existence and uniqueness of various classes of
solutions in the flat boundary case.
We study with elementary tools the stationary 3D Navier-Stokes
equations in a flat domain, equipped with Navier (slip without friction)
boundary conditions. We prove existence and uniqueness of weak,
strong, and very-weak solutions in appropriate Banach spaces and
most of the result hold true without restrictions on the size of the
data. Results are partially known, but our approach allows us to
give rather elementary and self-contained proofs.