F. Philipp

activity

20102023

most citedSpectral enclosures for a class of block operator matrices

8 citations · 36 across the 32 of their papers we have counts for

collaborators

Showing 2019Show all

4 papers · 1 filter

math.FA2019★ 1 cited

Time-Frequency Shift Invariance of Gabor Spaces with an $S_{0}$ -Generator

Andrei Caragea, Dae Gwan Lee, Friedrich Philipp +1

We consider Gabor Riesz sequences generated by a lattice $Λ \subset R^{2}$ and a window function $g \in L^{2} (R)$ which is well localized in both time and frequency. W…

math.FA2019

A quantitative subspace Balian-Low theorem

Andrei Caragea, Dae Gwan Lee, Friedrich Philipp +1

Let $G \subset L^{2} (R)$ be the subspace spanned by a Gabor Riesz sequence $(g, Λ)$ with $g \in L^{2} (R)$ and a lattice $Λ \subset R^{2}$ of rational density.…

math.SP2019

Relatively bounded perturbations of J-non-negative operators

Friedrich Philipp

We improve known perturbation results for self-adjoint operators in Hilbert spaces and prove spectral enclosures for diagonally dominant $J$ -self-adjoint operator matrices. These a…

math.SP2019★ 8 cited

Spectral enclosures for a class of block operator matrices

Juan Giribet, Matthias Langer, Francisco Martínez Pería +2

We prove new spectral enclosures for the non-real spectrum of a class of $2 \times 2$ block operator matrices with self-adjoint operators $A$ and $D$ on the diagonal and operators $B…

Time-Frequency Shift Invariance of Gabor Spaces with an S0​-Generator

A quantitative subspace Balian-Low theorem

Relatively bounded perturbations of J-non-negative operators

Spectral enclosures for a class of block operator matrices

Time-Frequency Shift Invariance of Gabor Spaces with an $S_{0}$ -Generator