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arXiv 1802.06269math.AP
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系数依赖于x的多项时间分数阶扩散方程的Initial-boundary value problems

Initial-boundary value problems for multi-term time-fractional diffusion equations with x-dependent coefficients

Zhiyuan Li, Xinchi Huang, Masahiro Yamamoto

摘要:

本文讨论了系数依赖于x的多项时间分数阶扩散方程的初边值问题。利用Mittag-Leffler函数和本征函数展开,将IBVP化为一个等价的积分方程,证明了该方程解的存在唯一性和解析性.特别地,在时间分数阶导数的系数均为非负的情况下,通过Laplace变换和逆拉普拉斯变换,发现解的长时间衰减速率主要由时间分数阶导数的最低阶决定.最后,作为解的解析性的应用,建立了由一个内点观测值确定多项时间分数阶扩散方程分数阶反问题的唯一性.

英文摘要:

In this paper, we discuss an initial-boundary value problem (IBVP) for the multi-term time-fractional diffusion equation with x-dependent coefficients. By means of the Mittag-Leffler functions and the eigenfunction expansion, we reduce the IBVP to an equivalent integral equation to show the unique existence and the analyticity of the solution for the equation. Especially, in the case where all the coefficients of the time-fractional derivatives are non-negative, by the Laplace and inversion Laplace transforms, it turns out that the decay rate of the solution for long time is dominated by the lowest order of the time-fractional derivatives. Finally, as an application of the analyticity of the solution, the uniqueness of an inverse problem in determining the fractional orders in the multi-term time-fractional diffusion equations from one interior point observation is established.

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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