Vladimir Gol'dshtein, Paz Hashash, Alexander Ukhlov
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On differentiability of Sobolev functions with respect to the Sobolev norm
We study connections between the -differentiability and the -differentiability of Sobolev functions. We prove that -differentiability implies the -differentiability, but the opposite implication is not valid. The notion of approximate differentiability is discussed as well. In addition, we consider the -differentiability of Sobolev functions -almost everywhere.
期刊介绍:
Mathematische Nachrichten - Mathematical News publishes original papers on new results and methods that hold prospect for substantial progress in mathematics and its applications. All branches of analysis, algebra, number theory, geometry and topology, flow mechanics and theoretical aspects of stochastics are given special emphasis. Mathematische Nachrichten is indexed/abstracted in Current Contents/Physical, Chemical and Earth Sciences; Mathematical Review; Zentralblatt für Mathematik; Math Database on STN International, INSPEC; Science Citation Index