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Sobolev spaces and hyperbolic fillings

  • Mario Bonk EMAIL logo and Eero Saksman
Published/Copyright: July 31, 2015

Abstract

Let Z be an Ahlfors Q-regular compact metric measure space, where Q>0. For p>1 we introduce a new (fractional) Sobolev space Ap(Z) consisting of functions whose extensions to the hyperbolic filling of Z satisfy a weak-type gradient condition. If Z supports a Q-Poincaré inequality with Q>1, then AQ(Z) coincides with the familiar (homogeneous) Hajłasz–Sobolev space.

Award Identifier / Grant number: DMS-0456940

Award Identifier / Grant number: DMS-0652915

Award Identifier / Grant number: DMS-1058283

Award Identifier / Grant number: DMS-1058772

Award Identifier / Grant number: DMS-1162471

Funding statement: Mario Bonk was supported by NSF grants DMS-0456940, DMS-0652915, DMS-1058283, DMS-1058772, and DMS-1162471. Eero Saksman was supported by the Finnish CoE in Analysis and Dynamics Research, and by the Academy of Finland, projects 113826 and 118765.

Acknowledgements

The authors are indebted to Marc Bourdon, Bruce Kleiner, Pierre Pansu, and Tomas Soto for many interesting discussions relating to the topic of this paper. They also thank Jeff Lindquist for a careful reading of a draft of the paper.

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Received: 2014-9-9
Revised: 2015-3-29
Published Online: 2015-7-31
Published in Print: 2018-4-1

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