2024 : 11 : 23
Asghar Rahimi

Asghar Rahimi

Academic rank: Professor
ORCID:
Education: PhD.
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Research

Title
A note on norm retrievable real Hilbert space frames
Type
JournalPaper
Keywords
Real Hilbert frames Fusion frame Finitely full spark Full spark Phase retrieval Norm retrieval
Year
2022
Journal JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
DOI
Researchers Fateh Akrami ، Peter G. Casazza ، Mohammadali Hasankhani Fard ، Asghar Rahimi

Abstract

In this manuscript, we present several new results in finite and countable dimen- sional real Hilbert space norm retrieval by vectors and projections. We make a detailed study of when hyperplanes do norm retrieval. Also, we show that the families of norm retrievable frames {fi}m i=1 in Rn are not dense in the family of m ≤ (2n − 2)-element sets of vectors in Rn for every finite n and the families of vectors which do norm retrieval in 2 are not dense in the infinite families of vectors in 2. We also show that if a Riesz basis does norm retrieval in 2 , then it is an orthogonal sequence. We provide numerous examples to show that our results are best possible.