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Asghar Rahimi

Asghar Rahimi

Academic rank: Professor
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Education: PhD.
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Research

Title
Ultra Bessel sequences in direct sums of Hilbert
Type
JournalPaper
Keywords
Frame of subspaces, Ultra Bessel sequence,
Year
2015
Journal Wavelets and Linear Algebra
DOI
Researchers mohamadreza Abdollahpour ، Asghar Rahimi

Abstract

In this paper, we establish some new results in ultra Bessel se- quences and ultra Bessel sequences of subspaces. Also, we in- vestigate ultra Bessel sequences in direct sums of Hilbert spaces. Specially, we show that f( fi; gi)g1 i=1 is a an ultra Bessel sequence for Hilbert space H K if and only if f fig1 i=1 and fgig1 i=1 are ultra Bessel sequences for Hilbert spaces H and K; respectively.