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Outer Minkowski content for some classes of closed sets. (English) Zbl 1152.28005
Summary: We find conditions ensuring the existence of the outer Minkowski content for $d$-dimensional closed sets in ${ℝ}^{d}$, in connection with regularity properties of their boundaries. Moreover, we provide a class of sets (including all sufficiently regular sets) stable under finite unions for which the outer Minkowski content exists. It follows, in particular, that finite unions of sets with Lipschitz boundary and a type of sets with positive reach belong to this class.
##### MSC:
 28A75 Length, area, volume, other geometric measure theory 49Q15 Geometric measure and integration theory, integral and normal currents (optimization)
##### References:
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