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Orlicz-Sobolev spaces and imbedding theorems

open access: bronze, 1971
Thomas Donaldson, Neil S. Trudinger
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A density result in Sobolev spaces

open access: yesJournal de Mathématiques Pures et Appliquées, 2002
Let \(\Omega\) be an open set in \(\mathbb{R}^n\). The author considers the problem of the density of ``nice'' functions, satisfying the Neumann boundary condition, in the Sobolev space \(W^{1,p}(\Omega)\). He proves two theorems on this density, one for the case of polygonal sets which have Lipschitz boundary contained in a finite union of hyperplanes,
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