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arXiv 2201.11426math.APmath.FA
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经典Friedrichs微分算子的分类:一维标量情形

Classification of classical Friedrichs differential operators: One-dimensional scalar case

Marko Erceg, Sandeep Kumar Soni

摘要:

由Ern、Guermond和Caplain(2007)引入的抽象Friedrichs算子理论被证明是研究一阶偏微分方程的正对称系统(Friedrichs,1958)的成功背景,现在更好地称为Friedrichs系统。最近,Antonić,Michelangeli和Erceg(2017)提出了抽象弗里德里希算子的纯算子理论描述,允许应用泛算子扩张理论(Grubb,1968)。在本文中,我们作出了进一步的理论步骤,通过开发的图空间(最大域)作为一个直和的最小域和相应的伴随核的分解。然后,我们研究一维标量(经典)弗里德里希算子的变系数,并提出了一个完整的分类的可容许边界条件。

英文摘要:

The theory of abstract Friedrichs operators, introduced by Ern, Guermond and Caplain (2007), proved to be a successful setting for studying positive symmetric systems of first order partial differential equations (Friedrichs, 1958), nowadays better known as Friedrichs systems. Recently, Antonić, Michelangeli and Erceg (2017) presented a purely operator-theoretic description of abstract Friedrichs operators, allowing for application of the universal operator extension theory (Grubb, 1968). In this paper we make a further theoretical step by developing a decomposition of the graph space (maximal domain) as a direct sum of the minimal domain and the kernels of corresponding adjoints. We then study one-dimensional scalar (classical) Friedrichs operators with variable coefficients and present a complete classification of admissible boundary conditions.

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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