2 citations · 3 across the 4 of their papers we have counts for
4 papers
Scalable Frames
Gitta Kutyniok, Kasso A. Okoudjou, Friedrich Philipp +1
Tight frames can be characterized as those frames which possess optimal numerical stability properties. In this paper, we consider the question of modifying a general frame to gene…
Local spectral theory for normal operators in Krein spaces
Friedrich Philipp, Vladimir Strauss, Carsten Trunk
Sign type spectra are an important tool in the investigation of spectral properties of selfadjoint operators in Krein spaces. It is our aim to show that also sign type spectra for…
Bounds on the non-real spectrum of differential operators with indefinite weights
Jussi Behrndt, Friedrich Philipp, Carsten Trunk
Ordinary and partial differential operators with an indefinite weight function can be viewed as bounded perturbations of non-negative operators in Krein spaces. Under the assumptio…
Local Definitizability of and
Friedrich Philipp, André C. M. Ran, Michał Wojtylak
The spectral properties of two products and of possibly unbounded operators and in a Banach space are considered. The results are applied in the comparison of loc…