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Abstract. In this work we consider an irreducible and recurrent symmetric Dirichlet space EY F on a locally compact separable metric space X with reference measure m, such that the transition function pt xY Á of the associated Hunt's process is absolutely continuous w.r.t. m, for quasi every x e X . We then give estimates for (1-order) capacities CapNv of the nodal  set Nv X fx e X X vx 0g of a function v in the extended space F , by proving Poincaree Wirtinger-type inequalities where the ``constant'' involved actually depends on CapNv . We then derive estimates for the capacity of a closed set F, similar to those proved by K.-Th.  Sturm. For example, when a Poincare-Wirtinger's inequality holds true these estimates are of the following form: 2 CapF constXvF RF À vF RÀ2 R r dr 0 vF r 3À1  where vF r mfx e X X 0 ` rxY F ` rg is the volume growth function of the Caratheodory metric r associated with the strongly local part of the Dirichlet space and RF X supx e X rxY F . From these bounds criteria for polarity of not necessarily
Forum Mathematicum – de Gruyter
Published: Dec 8, 1999
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