2 citations · 5 across the 7 of their papers we have counts for
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A note on the invertibility of the Gabor frame operator on certain modulation spaces
Dae Gwan Lee, Friedrich Philipp, Felix Voigtlaender
We consider Gabor frames generated by a general lattice and a window function that belongs to one of the following spaces: the Sobolev space , the weighted…
Finite Rank Perturbations of Linear Relations and Matrix Pencils
Leslie Leben, Francisco Martínez-Pería, Friedrich Philipp +2
We elaborate on the deviation of the Jordan structures of two linear relations that are finite-dimensional perturbations of each other. We compare their number of Jordan chains of…
Frame Properties of Operator Orbits
Ole Christensen, Marzieh Hasannasab, Friedrich Philipp
We consider sequences in a Hilbert space of the form with a linear operator , the index set being either or , a…
The numerical range of non-negative operators in Krein spaces
Friedrich Philipp, Carsten Trunk
We define and characterize the Krein space numerical range and the Krein space co-numerical range of a non-negative operator in a Krein space. It is show…