- 06-206 Johannes Kellendonk, Serge Richard
- Levinson's theorem for Schroedinger operators with
point interaction: a topological approach
Jul 20, 06
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Abstract. 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.