ter Elst, A F MRobinson, Derek2015-12-071424-3199http://hdl.handle.net/1885/25890We characterize the invariance under a submarkovian semigroup of a measurable subset by capacity conditions on its boundary.Keywords: Capacity; Dirichlet form; Invariance200810.1007/s00028-008-0398-z2016-02-24