Characterizations of variable fractional Haj{\l}asz-Sobolev spaces
Let (X, \r{ho},\mu) be a space of homogeneous type, a variable exponent satisfying the globally log-Holder continuous condition. In this article, the author introduce the variable fractional Sobolev spaces on X via Haj{\l}asz gradient. Using various maximal functions, several characterizations of this space are established.