Sobolev embedding

Hi all,

I know a proof that there is an injection of H^m(R^n) into C^k(R^n)
if m>n/2+k, and this proof use fourier transform, etc .. but how can
one prove such a result with an arbitrary open set Omega : H^m(0mega)
-> C^k(Omega) ?

thank you,
Fedor

.

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