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arXiv 1402.7192math.FA
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函数的截面与Sobolev型不等式

Sections of functions and Sobolev type inequalities

V. I. Kolyada

摘要:

本文研究了二元函数的平行于坐标轴的直线截面满足$0<\a\le 1.$阶Lipschitz条件,证明了如果对一个函数$f$,这些截面的$\operatorname{Lip} \a-$范数属于Lorentz空间$L^{p,1}(\R) \,(p=1/\a),$,则$f$可以在一个测度为零的集合上修改,从而使其在$\R^2.$上成为有界的一致连续的。对于$\a=1$,这是Sobolev定理的推广。空间$W_1^{2,2}(\R^2)$函数的连续性。我们证明了外$L^{p,1}-$范数不能被较弱的Lorentz范数$L^{p,q}$和$q>1$所取代.

英文摘要:

We study functions of two variables whose sections by the lines parallel to the coordinate axis satisfy Lipschitz condition of the order $0<\a\le 1.$ We prove that if for a function $f$ the $\operatorname{Lip} \a-$ norms of these sections belong to the Lorentz space $L^{p,1}(\R) \,(p=1/\a),$ then $f$ can be modified on a set of measure zero so as to become bounded and uniformly continuous on $\R^2.$ For $\a=1$ this gives an extension of Sobolev's theorem on continuity of functions of the space $W_1^{2,2}(\R^2)$. We show that the exterior $L^{p,1}-$ norm cannot be replaced by a weaker Lorentz norm $L^{p,q}$ with $q>1$.

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