On Possible Values of Upper and Lower Derivatives with Respect to Convex Differential Bases
2004
It is proved that if a convex density-like differential basis B is centered and invariant with respect to translations and homotheties, then the integral means of a nonnegative integrable function with respect to B can boundedly diverge only on a set of measure zero (this generalizes a theorem of Guzman and Menarguez); it is established that both translation and homothety invariances are necessary.
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