Published Paper
Inserted: 24 jul 2019
Last Updated: 22 oct 2021
Journal: Math. Z.
Volume: 299
Number: 3-4
Pages: 18
Year: 2021
Abstract:
Let $E \subset \mathbb R^N$ be a compact set and $C\subset \mathbb R^N$ be a convex body with $0\in{\rm int}\,C$. We prove that the topological boundary of the anisotropic enlargement $E+rC$ is contained in a finite union of Lipschitz surfaces. We also investigate the regularity of the volume function $V_E(r):=
E+rC
$ proving a formula for the right and the left derivatives at any $r>0$ which implies that $V_E$ is of class $C^1$ up to a countable set completely characterized. Moreover, some properties on the second derivative of $V_E$ are proved.
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