60 citations · 414 across the 46 of their papers we have counts for
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math-ph2011★ 7 cited
Cyclicity in rank-one perturbation problems
Evgeny Abakumov, Constanze Liaw, Alexei Poltoratski
The property of cyclicity of a linear operator, or equivalently the property of simplicity of its spectrum, is an important spectral characteristic that appears in many problems of…
math.FA2011★ 8 cited
A geometric approach to finite rank unitary perturbations
Ronald G. Douglas, Constanze Liaw
For a fixed natural number n, we consider a family of rank n unitary perturbations of a completely non-unitary contraction (cnu) with deficiency indices (n,n) on a separable Hilber…