Browsing by Subject "(skew-)self-adjoint operators"
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Publication without files Boundary systems and (skew-)self-adjoint operators on infinite metric graphsWe generalize the notion of Lagrangian subspaces to self-orthogonal subspaces with respect to a (skew-) symmetric form, thus characterizing (skew-)self-adjoint and unitary operators by means of self-orthogonal subspaces. By orthogonality preserving mappings, these characterizations can be transferred to abstract boundary value spaces of (skew-)symmetric operators. Introducing the notion of boundary systems we then present a unified treatment of different versions of boundary triples and related concepts treated in the literature. The application of the abstract results yields a description of all (skew-)self-adjoint realizations of Laplace and first derivative operators on graphs.Publicationtype: Journal ArticleCitation Publisher Version:Mathematische Nachrichten 288 (14/15): 1776-1785 (2015-10-01)Publisher DOI:10.1002/mana.20150005487