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Density of continuous functions in Sobolev spaces with applications to capacity.

Authors :
Eriksson-Bique, Sylvester
Poggi-Corradini, Pietro
Source :
Transactions of the American Mathematical Society, Series B. 7/12/2024, Vol. 11, p901-944. 44p.
Publication Year :
2024

Abstract

We show that capacity can be computed with locally Lipschitz functions in locally complete and separable metric spaces. Further, we show that if (X,d,\mu) is a locally complete and separable metric measure space, then continuous functions are dense in the Newtonian space N^{1,p}(X). Here the measure \mu is Borel and is finite and positive on all metric balls. In particular, we don't assume properness of X, doubling of \mu or any Poincaré inequalities. These resolve, partially or fully, questions posed by a number of authors, including J. Heinonen, A. Björn and J. Björn. In contrast to much of the past work, our results apply to locally complete spaces X and dispenses with the frequently used regularity assumptions: doubling, properness, Poincaré inequality, Loewner property or quasiconvexity. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
23300000
Volume :
11
Database :
Academic Search Index
Journal :
Transactions of the American Mathematical Society, Series B
Publication Type :
Academic Journal
Accession number :
178424498
Full Text :
https://doi.org/10.1090/btran/188