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 2014Show all

3 papers · 1 filter

math.FA2014

Measures of scalability

Xuemei Chen, Gitta Kutyniok, Kasso A. Okoudjou +2

Scalable frames are frames with the property that the frame vectors can be rescaled resulting in tight frames. However, if a frame is not scalable, one has to aim for an approximat…

math.SP2014

Spectral Points of Type $π_{+}$ and Type $π_{-}$ of Closed Operators in Indefinite Inner Product Spaces

Friedrich Philipp, Carsten Trunk

We introduce the notion of spectral points of type $π_{+}$ and type $π_{-}$ of closed operators $A$ in a Hilbert space which is equipped with an indefinite inner product. It is shown t…

math.FA2014★ 3 cited

Phase Retrieval from 4N-4 Measurements

Friedrich Philipp

We prove by means of elementary methods that phase retrieval of complex polynomials p of degree less than N is possible with 4N-4 phaseless Fourier measurements of p and p'. In add…

Measures of scalability

Spectral Points of Type π+​ and Type π−​ of Closed Operators in Indefinite Inner Product Spaces

Phase Retrieval from 4N-4 Measurements

Spectral Points of Type $π_{+}$ and Type $π_{-}$ of Closed Operators in Indefinite Inner Product Spaces