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by Johannes F. Brasche, Mark Malamud, Hagen Neidhardt
Integral Equations Operator Theory 43 (2002
http://www.ma.utexas.edu/mp_arc/c/01/01-183.ps.gz
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Abstract:
We characterize the spectra of self-adjoint extensions of a symmetric operator with equal deciency indices in terms of boundary values of their Weyl functions. A complete description is obtained for the point and absolutely continuous spectrum while for the singular continuous spectrum additional assumptions are needed. The results are illustrated by examples. 1
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