New characterizations of Hajłasz-Sobolev type spaces with variable exponent on metric measure spaces

In this article, we introduce classes of functions whose increment is controlled by the measure of a ball containing the corresponding points and a nonnegative function p(.) that is summable with respect to measure. These classes of functions can be considered as spaces with variable smoothness depending on the structure of the measure in a neighborhood of a given point. Moreover, we present several descriptions generalized classes of variable exponent Hajłasz-Sobolev type on metric measure spaces by various maximal functions and we establish the equivalence between them.

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