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Levinson's theorem for Schrödinger operators with point interaction: a topological approach
2006
Journal of Physics A: Mathematical and General
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In this note Levinson theorems for Schroedinger operators in R^n with one point interaction at 0 are derived using the concept of winding numbers. These results are based on new expressions for the associated wave operators.
doi:10.1088/0305-4470/39/46/011
fatcat:3yi5jmmkorfjriwezb5ckahglu