22 citations · 107 across the 27 of their papers we have counts for
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math.SP2013★ 3 cited
On an estimate in the subspace perturbation problem
Albrecht Seelmann
The problem of variation of spectral subspaces for linear self-adjoint operators under an additive bounded perturbation is considered. The aim is to find the best possible upper bo…
math.SP2013★ 17 cited
Notes on the sin2Θ theorem
Albrecht Seelmann
An analogue of the Davis-Kahan sin2Θ theorem from [SIAM J. Numer. Anal. 7 (1970), 1--46] is proved under a general spectral separation condition. This extends the generic sin2θ est…
math.SP2013★ 1 cited
Reducing graph subspaces and strong solutions to operator Riccati equations
Konstantin A. Makarov, Stephan Schmitz, Albrecht Seelmann
The problem of block diagonalization for diagonally dominant symmetric block operator matrices with self-adjoint diagonal entries is considered. We show that a reasonable block dia…