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arXiv 2306.07155math.AP
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快速扩散情形下多孔介质方程的超热量函数

Supercaloric functions for the porous medium equation in the fast diffusion case

Kristian Moring, Christoph Scheven

AI总结:

本文研究快速扩散多孔介质方程的超热量函数,证明有界情形为弱上解,并在超临界范围将其划分为两类,且探讨其逐点行为与弱上解的联系。

摘要:

我们研究了一类广义的上解,即快速扩散情形下多孔介质方程的所谓超热量函数。超热量函数被定义为满足抛物型比较原理的下半连续函数。我们证明了有界超热量函数是弱上解。在超临界范围内,我们证明了无界超热量函数可以被划分为由Barenblatt解和无限点源解决定的两个互斥类别,并给出了这些类别的若干刻画。此外,我们研究了超热量函数的逐点行为,并获得了超热量函数与弱上解之间的联系。

英文摘要:

We study a generalized class of supersolutions, so-called supercaloric functions to the porous medium equation in the fast diffusion case. Supercaloric functions are defined as lower semicontinuous functions obeying a parabolic comparison principle. We prove that bounded supercaloric functions are weak supersolutions. In the supercritical range, we show that unbounded supercaloric functions can be divided into two mutually exclusive classes dictated by the Barenblatt solution and the infinite point-source solution, and give several characterizations for these classes. Furthermore, we study the pointwise behavior of supercaloric functions and obtain connections between supercaloric functions and weak supersolutions.

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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