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Powers Of Generators On Dirichlet Spaces And Applications To Harnack Principles

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arxiv 2010.01036 v2 pith:Z22E5ETZ submitted 2020-10-02 math.AP

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We provide a general framework for the realization of powers or functions of suitable operators on Dirichlet spaces. The first contribution is to unify the available results dealing with specific geometries; a second one is to provide new results on rather general metric measured spaces that were not considered before and fall naturally in the theory of Dirichlet spaces. The main tool is using the approach based on subordination and semi-groups by Stinga and Torrea. Assuming more on the Dirichlet space, we derive several applications to PDEs such as Harnack and Boundary Harnack principles.

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  1. Self-improvement of fractional Hardy inequalities in metric measure spaces via hyperbolic fillings

    math.AP 2024-12 conditional novelty 8.0 of 10

    Fractional Hardy inequalities in doubling metric measure spaces self-improve in both the power p and the regularity theta, via an equivalence with Hardy inequalities in hyperbolic fillings.

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