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arXiv 1405.7891math.AP
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关于C ^k空间中Euler方程的注记

Note on the Euler equations in C^k spaces

Tarek M. Elgindi, Nader Masmoudi

摘要:

本文利用我们最近的文章\cite{EM}中的思想,证明了二维Euler方程在$C^k$空间中的强不适定性.这说明提供了一个显着较短的证明许多主要结果在\cite{BLi2}。在$k>1$的情况下,我们表明存在的初始数据的速度场的$kth$导数立即开发对数奇异性。强不适定性也覆盖了$C^{k-1,1}$空间。不适定性来自于欧拉方程中的压力项。我们将$D^k u$的方程表示为:$$\partial_t D^k u=D^{k+1} p + l.o.t.$$,然后利用映射$u\rightarrow p$的非局部性得到不适定性。真正的困难在于如何处理"l.o.t."。"可以通过特殊的交换子估计来处理的项。

英文摘要:

In this note, using the ideas from our recent article \cite{EM}, we prove strong ill-posedness for the 2D Euler equations in $C^k$ spaces. This note provides a significantly shorter proof of many of the main results in \cite{BLi2}. In the case $k>1$ we show the existence of initial data for which the $kth$ derivative of the velocity field develops a logarithmic singularity immediately. The strong ill-posedness covers $C^{k-1,1}$ spaces as well. The ill-posedness comes from the pressure term in the Euler equation. We formulate the equation for $D^k u$ as: $$\partial_t D^k u=D^{k+1} p + l.o.t.$$ and then use the non-locality of the map $u\rightarrow p$ to get the ill-posedness. The real difficulty comes in how to deal with the "l.o.t." terms which can be handled by special commutator estimates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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