Physics – Mathematical Physics
Scientific paper
2000-04-11
Physics
Mathematical Physics
Latex, 25 pages. Published in The Arnoldfest: Proceedings of a Conference in Honour of V.I.Arnold for His Sixtieth Birthday, F
Scientific paper
This work is the direct continuation of the author's note published in Russian Math Surveys 52 (1997), no 6. Discrete Schrodinger operators on graphs and higher dimensional simplicial complexes are considered. A vector-valued symplectic form on the space of solutions is consructed. This form, "Symplectic Wronskian", takes value in the group of 1-dimensional cycles. This construction has important applications for the Scattering Theory on graphs with tails. Effective diagonalization of the real Fermionic quadratic form is presented in the Appendix. This construction appeared first time in 1987 in the author's paper dedicated to an analogue of Morse theory for vector fields (it was published as an Appendix to the author's joint paper with M.Shubin, Soviet Math Dokl 34 (1987) no 1).
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