It is well known that the Helmholtz decomposition of Lq -spaces fails to exist for certain unbounded smooth planar domains unless q = 2, see , . As recently shown , the Helmholtz projection does exist for general unbounded domains of uniform C2-type in ℝ3 if we replace the space Lq , 1 < q < ∞, by L2 ∩ Lq for q > 2 and by Lq + L2 for 1 < q < 2. In this paper, we generalize this new approach from the three-dimensional case to the n-dimensional case, n ≥ 2. By these means it is possible to define the Stokes operator in arbitrary unbounded domains of uniform C2-type.
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