174 citations · 478 across the 30 of their papers we have counts for
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math.FA1998
Symmetric approximation of frames and bases in Hilbert spaces
M. Frank, V. I. Paulsen, T. R. Tiballi
We consider existence and uniqueness of symmetric approximation of frames by normalized tight frames and of symmetric orthogonalization of bases by orthonormal bases in Hilbert spa…
math.OA1998★ 1 cited
Normal conditional expectations of finite index and sets of modular generators
Michael Frank
Normal conditional expectations E: M --> N in M of finite index on von Neumann algebras M with discrete center are investigated to find an estimate for the minimal number of genera…
math.OA1998★ 42 cited
On conditional expectations of finite index
M. Frank, E. Kirchberg
For a conditional expectation E on a (unital) C*-algebra A there exists a real number K>=1 such that the mapping (K.E-id_A) is positive if and only if there exists a real number L>…