Boundary relations and their Weyl families

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SPECTRA OF SELF-ADJOINT EXTENSIONS AND APPLICATIONS TO SOLVABLE SCHRÖDINGER OPERATORS (2006, background): “Another possibility would be to use some generalization of boundary triples, for example, the so-called boundary relations resulting in unbounded We yl functions [26, 48], but it seems that this technique is rather new and not develop ed enough for applications.”
Elliptic operators, Dirichlet-to-Neumann maps and quasi boundary triples (2012, methodology): “Other generalizations of boundary triples and abstract concepts of boundary mappings were studied, e.g. in [Ar- linskĭı, 2000; Derkach et al., 2006, 2009; Kopachevskĭı and Krĕın, 2004; Posilicano, 2004, 2008; Mogilevskĭı, 2006, 2009], The aim of the present paper is to give an introduction to…”
A general factorization approach to the extension theory of nonnegative operators and relations (2007, unknown): “[10].”