Abstract
We prove that the Rieffel sharpness condition for a Banach space E is necessary and sufficient for an arbitrary Lipschitz function f: [a, b]→E to be differentiable almost everywhere on a segment [a, b]. We establish that, in the case where the sharpness condition is not satisfied, the major part (in the category sense) of Lipschitz functions has no derivatives at any point of the segment [a, b].
Similar content being viewed by others
References
A. V. Bondar’, Local Geometric Characteristics of Holomorphic Mappings [in Russian], Naukova Dumka, Kiev (1992).
H. Federer, The Geometric Theory of Measure, Interscience, Providence (1969).
M. A. Rieffei, “The Radon-Nikodym theorem for the Bochner integral,” Trans. Am. Math. Soc., 131, 466–487 (1968).
J. Diestel, The Geometry of Banach Spaces [Russian translation], Vyshcha Shkola, Kiev (1980).
K. Kuratowski, Topology [Russian translation], Vol. 1, Mir, Moscow (1966).
W. Rudin, Functional Analysis [Russian translation], Mir, Moscow (1975).
S. G. Krein (editor), Functional Analysis [in Russian], Nauka, Moscow (1972).
Additional information
Institute of Mathematics, Ukrainian Academy of Sciences, Kiev. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 49, No. 4, pp. 500–509, April, 1997.
Rights and permissions
About this article
Cite this article
Bondar’, A.V. On differential properties of mappings into a Banach space. Ukr Math J 49, 550–560 (1997). https://doi.org/10.1007/BF02487317
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02487317