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arXiv 0910.5876math.AP
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二维椭圆问题的正则性与奇性

Regularity versus singularities for elliptic problems in two dimensions

Lisa Beck

摘要:

在二维情形下,非线性椭圆方程组$\rm{div} a(x,u,Du)=0$的每一个弱解都具有Hölder连续的一阶导数,条件是标准的连续性、椭圆性和增长性假设在增长指数为$p \geq 2$时成立.我们给出一个例子,表明这一结果不能推广到次二次的情况下,即弱解不一定是连续的,如果$1< p <2$。此外,我们还讨论了变分积分的相关结果。

英文摘要:

In two dimensions every weak solution to a nonlinear elliptic system $\rm{div} a(x,u,Du)=0$ has Hölder continuous first derivatives provided that standard continuity, ellipticity and growth assumptions hold with a growth exponent $p \geq 2$. We give an example showing that this result cannot be extended to the subquadratic case, i.e. that weak solutions are not necessarily continuous if $1< p <2$. Furthermore, we discuss related results for variational integrals.

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