Indecomposable sets of finite perimeter in doubling metric measure spaces
Bonicatto, Paolo; Pasqualetto, Enrico; Rajala, Tapio (2020). Indecomposable sets of finite perimeter in doubling metric measure spaces. Calculus of Variations and Partial Differential Equations, 59 (2), 63. DOI: 10.1007/s00526-020-1725-7
© 2020 the Authors
We study a measure-theoretic notion of connectedness for sets of finite perimeter in the setting of doubling metric measure spaces supporting a weak (1,1)-Poincaré inequality. The two main results we obtain are a decomposition theorem into indecomposable sets and a characterisation of extreme points in the space of BV functions. In both cases, the proof we propose requires an additional assumption on the space, which is called isotropicity and concerns the Hausdorff-type representation of the perimeter measure.