Kühn, ChristianChristianKühnRohleder, JonathanJonathanRohleder2019-08-192019-08-192018-02-06Journal of Physics A: Mathematical and Theoretical 9 (51): 095204 (2018-02-06)http://hdl.handle.net/11420/3124We investigate the relation between the eigenvalues of the Laplacian with Kirchhoff vertex conditions on a finite metric graph and a corresponding Titchmarsh-Weyl function (a parameter-dependent Neumann-to-Dirichlet map). We give a complete description of all real resonances, including multiplicities, in terms of the edge lengths and the connectivity of the graph, and apply it to characterize all eigenvalues which are visible for the Titchmarsh-Weyl function.en0301-001520189Journal Article10.1088/1751-8121/aaa884Other