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arXiv 1301.1872math.AP
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非线性抛物型方程的整体估计

Global estimates for nonlinear parabolic equations

Paolo Baroni, Agnese Di Castro, Giampiero Palatucci

摘要:

考虑$a$上标准增长条件下的$$ u_t - div a(x, t, Du)= f(x,t) on Ω_T = Ω\times (-T,0), $$型非线性抛物型方程,其中仅假设$f$是可积的.我们证明了一般的衰减估计的解决方案$u$和梯度$Du$,这意味着在Lebesgue和Lorentz空间非常一般的估计水平集的边界。仅假设所涉及的区域满足一个温和的外部容量密度条件,我们提供了全局正则性结果。

英文摘要:

We consider nonlinear parabolic equations of the type $$ u_t - div a(x, t, Du)= f(x,t) on Ω_T = Ω\times (-T,0), $$ under standard growth conditions on $a$, with $f$ only assumed to be integrable. We prove general decay estimates up to the boundary for level sets of the solutions $u$ and the gradient $Du$ which imply very general estimates in Lebesgue and Lorentz spaces. Assuming only that the involved domains satisfy a mild exterior capacity density condition, we provide global regularity results.

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