Journal of Operator Theory, Vol. 64, No. 2 (Fall 2010), pp. 401-416 (16 pages) We investigate the behaviour of the spectrum of selfadjoint operators in Krein spaces under perturbations with uniformly ...
In this paper, we determine whether or not certain natural classes of unitary multiplication operators on L2 (dθ) have common cyclic vectors. For some classes which have common cyclic vectors, we ...
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