On the Lr-differentiability of two Lusin-type classes and a full descriptive characterization of the HKr-integralстатья
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Дата последнего поиска статьи во внешних источниках: 1 октября 2025 г.
Аннотация:It is proved that any function of a Lusin-type class, the class ofACGr-functions, is differentiable almost everywhere in the sense of a derivative defined in the space L_r, 1 ⩽ r < ∞. This leads to a full descriptivecharacterization of a Henstock–Kurzweil-type integral, the HKr-integral,which serves to recover functions from their Lr-derivatives. The class ACGris compared with the classical Lusin class ACG, and it is shown that continuous ACG-functions can fail to be Lr-differentiable almost everywhere.