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Fundamenta Mathematicae

2009 | 205 | 3 | 191-217
Tytuł artykułu

Generalized α-variation and Lebesgue equivalence to differentiable functions

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EN
Abstrakty
EN
We find conditions on a real function f:[a,b] → ℝ equivalent to being Lebesgue equivalent to an n-times differentiable function (n ≥ 2); a simple solution in the case n = 2 appeared in an earlier paper. For that purpose, we introduce the notions of $CBVG_{1/n}$ and $SBVG_{1/n}$ functions, which play analogous rôles for the nth order differentiability to the classical notion of a VBG⁎ function for the first order differentiability, and the classes $CBV_{1/n}$ and $SBV_{1/n}$ (introduced by Preiss and Laczkovich) for Cⁿ smoothness. As a consequence, we deduce that Lebesgue equivalence to an n-times differentiable function is the same as Lebesgue equivalence to a function f which is (n-1)-times differentiable with $f^{(n-1)}(·)$ pointwise Lipschitz. We also characterize functions that are Lebesgue equivalent to n-times differentiable functions with a.e. nonzero derivatives. As a corollary, we establish a generalization of Zahorski's Lemma for higher order differentiability.
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Tom
Numer
Strony
191-217
Opis fizyczny
Daty
wydano
2009
Twórcy
autor
• Department of Mathematics, Weizmann Institute of Science, Rehovot 76100, Israel
• PIRA Energy Group, 3 Park Ave FL 26, New York, NY 10016, U.S.A.
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