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arXiv 2303.05940math.APmath.CAmath.FA
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分式索伯列夫空间入门

A First Course in Fractional Sobolev Spaces

Giovanni Leoni

摘要:

这本书提供了一个温和的介绍分数索伯列夫空间,发挥了核心作用的变分法,偏微分方程,和调和分析。第一部分讨论一元分数索伯列夫空间。它涵盖了定义,标准性质,扩展,嵌入,Hardy不等式和插值不等式。第二部分研究多元分式索伯列夫空间。作者研究了完备性、稠密性、齐次分式索伯列夫空间、嵌入、扩张的充要条件、Gagliardo-Nirenberg型插值不等式和迹理论。第三部分探讨了一些应用:分数索伯列夫空间中右端Poisson问题的内部正则性和分数Laplacian的一些基本性质。第一部分的书是访问先进的本科生有很强的背景,在整合理论;第二部分研究生有熟悉的措施和整合和一些泛函分析。索伯列夫空间的基本知识会有所帮助,但不是必需的。这本书也可以作为一个参考的数学家工作在变分法和偏微分方程以及研究人员在其他学科与坚实的数学背景。它包含几个练习,并且是独立的。

英文摘要:

This book provides a gentle introduction to fractional Sobolev spaces, which play a central role in the calculus of variations, partial differential equations, and harmonic analysis. The first part deals with fractional Sobolev spaces of one variable. It covers the definition, standard properties, extensions, embeddings, Hardy inequalities, and interpolation inequalities. The second part deals with fractional Sobolev spaces of several variables. The author studies completeness, density, homogeneous fractional Sobolev spaces, embeddings, necessary and sufficient conditions for extensions, Gagliardo-Nirenberg type interpolation inequalities, and trace theory. The third part explores some applications: interior regularity for the Poisson problem with the right-hand side in a fractional Sobolev space and some basic properties of the fractional Laplacian. The first part of the book is accessible to advanced undergraduates with a strong background in integration theory; the second part to graduate students having familiarity with measure and integration and some functional analysis. Basic knowledge of Sobolev spaces would help, but is not necessary. The book can also serve as a reference for mathematicians working in the calculus of variations and partial differential equations as well as for researchers in other disciplines with a solid mathematics background. It contains several exercises and is self-contained.

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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