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math.CO2023
Real matrices whose columns have equal modulus coordinates
Sara Botelho-Andrade, Peter G. Casazza, Desai Cheng +2
We study matrices whose columns are of the form \[\{(a_{1j},\ldots, a_{nj}): \quad a_{1j} = λ_j,\ a_{ij} = \pmλ_j\ , \ λ_j >0 ,\ j=1,2,\ldots,n\}.\] We explicitly cons…
math.FA2023★ 5 cited
A Survey of Fusion Frames in Hilbert Spaces
Lukas Köhldorfer, Peter Balazs, Pete Casazza +4
Fusion frames are a very active area of research today because of their myriad of applications in pure mathematics, applied mathematics, engineering, medicine, signal and image pro…
math.FA2023
Classifying weak phase retrieval
P. G. Casazza, F. Akrami
We will give several surprising equivalences and consequences of weak phase retrieval. These results give a complete understanding of the difference between weak phase retrieval an…