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- Title
Parabolicity on Graphs.
- Authors
Martínez-Pérez, Álvaro; Rodríguez, José M.
- Abstract
Large scale properties of Riemannian manifolds, in particular, those properties preserved by quasi-isometries, can be studied using discrete structures which approximate the manifolds. In a sequence of papers, M. Kanai proved that, under mild conditions, many properties are preserved by a certain (quasi-isometric) graph approximation of a manifold. One of these properties is p-parabolicity. A manifold M (respectively, a graph G) is said to be p-parabolic if all positive p-superharmonic functions on M (resp. G) are constant. This is equivalent to not having p-Green's function (i.e. a positive fundamental solution of the p-Laplace-Beltrami operator). Herein we study directly the p-parabolicity on graphs. We obtain some characterizations in terms of graph decompositions. Also, we give necessary and sufficient conditions for a uniform hyperbolic graph to be p-parabolic in terms of its boundary at infinity. Finally, we prove that if a uniform hyperbolic graph satisfies the (Cheeger) isoperimetric inequality, then it is non-p-parabolic for every 1 < p < ∞ .
- Subjects
ISOPERIMETRIC inequalities; RIEMANNIAN manifolds
- Publication
Results in Mathematics / Resultate der Mathematik, 2024, Vol 79, Issue 2, p1
- ISSN
1422-6383
- Publication type
Article
- DOI
10.1007/s00025-023-02095-y