Geodesic
Fractional Maximal Functions in Metric Measure Spaces
Analysis and Geometry in Metric Spaces, Tome 1 (2013) no. 1, pp. 147-162.

Voir la notice de l'article provenant de la source The Polish Digital Mathematics Library

We study the mapping properties of fractional maximal operators in Sobolev and Campanato spaces in metric measure spaces. We show that, under certain restrictions on the underlying metric measure space, fractional maximal operators improve the Sobolev regularity of functions and map functions in Campanato spaces to Hölder continuous functions. We also give an example of a space where fractional maximal function of a Lipschitz function fails to be continuous.
Mots-clés : Fractional maximal function, fractional Sobolev space, Campanato space, metric measure space 
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Heikkinen, Toni; Lehrbäck, Juha; Nuutinen, Juho; Tuominen, Heli. Fractional Maximal Functions in Metric Measure Spaces. Analysis and Geometry in Metric Spaces, Tome 1 (2013) no. 1, pp. 147-162. http://geodesic.mathdoc.fr/item/AGMS_2013_1_1_a7/