Abstract
This paper is devoted to the study of the subspace ofW m,r of functions that vanish on a part γ 0 of the boundary. The author gives a crucial estimate of the Poincaré constant in balls centered on the boundary of γ 0. Then, the convolution-translation method, a variant of the standard mollifier technique, can be used to prove the density of smooth functions that vanish in a neighborhood of γ 0, in this subspace. The result is first proved for m = 1, then generalized to the case where m ≥ 1, in any dimension, in the framework of Lipschitz-continuous domain. However, as may be expected, it is needed to make additional assumptions on the boundary of γ 0, namely that it is locally the graph of some Lipschitz-continuous function.
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Bernard, JM.E. Density results in sobolev spaces whose elements vanish on a part of the boundary. Chin. Ann. Math. Ser. B 32, 823–846 (2011). https://doi.org/10.1007/s11401-011-0682-z
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DOI: https://doi.org/10.1007/s11401-011-0682-z