松软
发表于 2025-3-28 17:40:25
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一再困扰
发表于 2025-3-28 19:40:40
1017-0480 esents a comprehensive survey of modern operator techniques for boundary value problems and spectral theory, employing abstract boundary mappings and Weyl functions. It includes self-contained treatments of the extension theory of symmetric operators and relations, spectral characterizations of self