On A. Zygmund differentiation conjecture

Details On A. Zygmund differentiation conjecture On A. Zygmund differentiation conjecture

2006-09-28

arxiv.org/abs/math/0609827v1

Mathematics

Classical Analysis and ODEs

Preliminary version

Scientific paper

Consider $v$ a Lipschitz unit vector field on $R^n$ and $K$ its Lipschitz constant. We show that the maps $S_s:S_s(X) = X + sv(X)$ are invertible for $0\leq |s|<1/K$ and define nonsingular point transformations. We use these properties to prove first the differentiation in L^p norm for $1\le p<\infty.$ Then we show the existence of a universal set of values $s\in [-1/2K,1/2K]$ of measure 1/K for which the Lipschitz unit vector fields $v\circ S_s^{-1}$ satisfy Zygmund's conjecture for all functions in $L^p(\R^n)$ and for each p, $1\leq p< \infty.$

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