In this paper the existence
and uniqueness of solutions of the initial boundary value problem for the Euler
equations for an incompressible fluid in a bounded domain Ω ⊂R3 is proved. As
boundary conditions the velocity vector and the pressure on boundary parts the fluid
enters and leaves the domain through are assumed, respectively. The existence of
solutions in Sobolev spaces for domains with dihedral angles π∕n, n = 2,3,… , is
shown.