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Elliptic operators, Dirichlet-to-Neumann maps and quasi boundary triples

Behrndt, Jussi and Langer, Matthias (2012) Elliptic operators, Dirichlet-to-Neumann maps and quasi boundary triples. In: Operator Methods for Boundary Value Problems. London Mathematial Society Lecture Note Series . Cambridge University Press, pp. 121-160. ISBN 9781107606111

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The notion of quasi boundary triples and their Weyl functions is reviewed and applied to self-adjointness and spectral problems for a class of elliptic, formally symmetric, second order partial differential expressions with variable coefficients on bounded domains.