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arXiv 1606.01378math.AP
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利用强最大值原理研究时空分数阶扩散方程的源反问题

Studies on an inverse source problem for a space-time fractional diffusion equation by constructing a strong maximum principle

Junxiong Jia, Jigen Peng, Jiaqing Yang

摘要:

本文重点研究了具有广义Caputo分数阶导数算子和一般空间非局部算子(分数阶拉普拉斯算子作为特例)的时空分数阶扩散方程。利用一个特殊的检验函数和空间非局部算子的一些性质,建立了一个弱Harnack不等式.基于弱Harnack不等式,得到了分数阶抛物型方程的一个重要刻画--强最大值原理.有了这些工具,我们建立了一个唯一性结果的反源问题的时间分量的非齐次项的确定。

英文摘要:

In this paper, we focus on a space-time fractional diffusion equation with the generalized Caputo's fractional derivative operator and a general space nonlocal operator (with the fractional Laplace operator as a special case). A weak Harnack's inequality has been established by using a special test function and some properties of the space nonlocal operator. Based on the weak Harnack's inequality, a strong maximum principle has been obtained which is an important characterization of fractional parabolic equations. With these tools, we establish a uniqueness result for an inverse source problem on the determination of the temporal component of the inhomogeneous term.

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