arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.12588math.AP
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具有Robin边界条件的时间分数阶扩散方程的适定性

On the well-posedness of the time-fractional diffusion equation with Robin boundary condition

Mengmeng Zhang, Jijun Liu

摘要:

分数阶时间导数扩散方程由于其分数阶导数的非局部性而具有重要的数学意义,可以用来模拟具有记忆效应的物理现象.考虑一类具有非齐次Robin边界条件的时间分数阶扩散方程的初边值问题.首先,我们证明了弱/强解的唯一存在性的基础上的特征函数的扩展,从而确保了适定性的正问题。然后,我们建立了时间分数阶扩散算子的Hopf引理,推广了经典抛物型方程的相应引理。基于这个新的Hopf引理,证明了时间分数阶扩散的最大值原理,这对于进一步研究该系统反问题的唯一性具有重要意义.

英文摘要:

The diffusion system with time-fractional order derivative is of great importance mathematically due to the nonlocal property of the fractional order derivative, which can be applied to model the physical phenomena with memory effects. We consider an initial-boundary value problem for the time-fractional diffusion equation with inhomogenous Robin boundary condition. Firstly, we show the unique existence of the weak/strong solution based on the eigenfunction expansions, which ensures the well-posedness of the direct problem. Then, we establish the Hopf lemma for time-fractional diffusion operator, generalizing the counterpart for the classical parabolic equation. Based on this new Hopf lemma, the maximum principles for this time-fractional diffusion are finally proven, which play essential roles for further studying the uniqueness of the inverse problems corresponding to this system.

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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