Inserted: 27 aug 2019
Last Updated: 4 jul 2020
Journal: Arch. Ration. Mech. Anal.
Given an elliptic integrand of class $C^3$, we prove that finite unions of disjoint open Wulff shapes with equal radii are the only volume-constrained critical points of the anisotropic surface energy among all sets with finite perimeter and reduced boundary almost equal to its closure.