Published Paper

Inserted: 16 may 2013
Last Updated: 20 feb 2015

Journal: Proc. Am. Math. Soc.
Volume: 143
Number: 5
Pages: 2069-2084
Year: 2015
Links: Link to the published version

Abstract:

It is well known that sets of finite perimeter can be strictly approximated by smooth sets, while, in general, one cannot hope to approximate an open set $\Omega$ of finite perimeter in $\mathbb{R}^n$ strictly from within. In this note we show that, nevertheless, the latter type of approximation is possible under the mild hypothesis that the $(n{-}1)$-dimensional Hausdorff measure of the topological boundary $\partial\Omega$ equals the perimeter of $\Omega$. We also discuss an optimality property of this hypothesis, and we establish a corresponding result on strict approximation of $\rm BV$-functions from a prescribed Dirichlet class.

Tags: GeMeThNES

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