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Author(s): 

Kabbaj s. | Rossfi m.

Issue Info: 
  • Year: 

    2018
  • Volume: 

    5
  • Issue: 

    2
  • Pages: 

    1-13
Measures: 
  • Citations: 

    0
  • Views: 

    139
  • Downloads: 

    54
Abstract: 

In this paper, a new notion of frames is introduced: -operator frame as generalization of -frames in Hilbert C-modules introduced by A. Alijani and M. A. Dehghan [2] and we establish some results.

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Writer: 

AHMADI R.

Issue Info: 
  • Year: 

    2016
  • Volume: 

    47
Measures: 
  • Views: 

    154
  • Downloads: 

    63
Abstract: 

SAMPLING THEOREM COMBINED WITH AN EFFICIENT RECONSTRUCTION ALGORITHM, HAS BEEN APPLIED SUCCESSFULLY TO PROVE IRREGULAR SAMPLING THEOREMS IN SPACES OF ANALYTIC FUNCTIONS, FOR SHORTTIME FOURIER TRANSFORMS AND WAVELET TRANSFORMS, AND FOR A GENERAL CLASSOF SPACES OF BAND-LIMITED FUNCTIONS.AN IMPORTANT INSTANCE OF THIS ALGORITHM OCCURS IN THE PRESENCE OF frameS IN A HILBERT SPACE.WE PRESENT A NEWMETHOD TO OBTAIN CONTINUOUS frame BOUNDS. IN THE APPLICATIONS TO IRREGULAR SAMPLING OF BAND-LIMITED FUNCTIONS THIS ALTERNATIVE STRATEGY LEADS TO BETTER AND EXPLICIT ESTIMATES OF THE CONTINUOUS frame BOUNDS.

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Writer: 

ALIJANI AZADEH

Issue Info: 
  • Year: 

    2013
  • Volume: 

    44
Measures: 
  • Views: 

    154
  • Downloads: 

    67
Abstract: 

CERTAIN FACTS ABOUT frameS ARE EXTENDED FOR THE DIFFERENT KINDS OF frameS IN HILBERT C*-MODULES. THE PAPER PRESENTS THE FUSION frameS WITH C*-VALUED BOUNDS IN HILBERT C*-MODULES WHERE THEY ARE CALLED *-FUSION frameS. ALSO, THE RELATIONS BETWEEN FUSION frameS AND *-FUSION frameS IN HILBERT C*-MODULES ARE GIVEN SUCH THAT *-FUSION frameS CAN BE STUDIED AS FUSION frameS WITH DIFFERENT BOUNDS.

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Author(s): 

Khosravi A. | Farmani M. R.

Issue Info: 
  • Year: 

    2022
  • Volume: 

    3
  • Issue: 

    1
  • Pages: 

    10-16
Measures: 
  • Citations: 

    0
  • Views: 

    53
  • Downloads: 

    2
Abstract: 

Abstract : In this paper, we investigate frames and g-frames and show that constructs the direct sum of frames for a finite number of frames. also, We show under what condition it becomes g-frames to T *−g-frames. Finally, we generalize Sun ’s theorem to Parseval frames.

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Issue Info: 
  • Year: 

    2023
  • Volume: 

    4
  • Issue: 

    3
  • Pages: 

    19-27
Measures: 
  • Citations: 

    0
  • Views: 

    31
  • Downloads: 

    2
Abstract: 

Tight frames and g-frames are extremely useful in applications. A scalable frame was recentlyintroduced as a frame with the property of generating a tight frame by rescaling its frame vectors. In thispaper, we generalize this concept to g-frames, introduce scalable g-frames, obtain some characterizationsfor them, and demonstrate that scalability is stable under unitary operators and isomorophisms betweentwo Hilbert spaces. In addition, we consider Paley-Wiener perturbations of g-frames and achieve someresults regarding the preservation of their g-frame property.

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Issue Info: 
  • Year: 

    2009
  • Volume: 

    18
Measures: 
  • Views: 

    233
  • Downloads: 

    267
Abstract: 

The aim of this article is to discuss operator monotone and operator convex functions, introduce some operator inequalities which are proved by operator monotone and operator convex functions.

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Issue Info: 
  • Year: 

    2016
  • Volume: 

    4
Measures: 
  • Views: 

    215
  • Downloads: 

    115
Keywords: 
Abstract: 

IN THIS PAPER, WE INTRODUCE THE NOTIONS OF operator (A, B, G) -MEAN, RELATIVE operator (A, B, G) -ENTROPY AND TSALLIS RELATIVE operator (A, B, G) -ENTROPY. WE GIVE UPPER AND LOWER BOUNDS OF RELATIVE operator (0, B, G) -ENTROPY AND TSALLIS RELATIVE operator (A, B, G) -ENTROPY WITH RESPECT TO operator (A, B, G) -MEAN.

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Author(s): 

FUJII J.I.

Issue Info: 
  • Year: 

    2008
  • Volume: 

    2
  • Issue: 

    2
  • Pages: 

    59-67
Measures: 
  • Citations: 

    0
  • Views: 

    355
  • Downloads: 

    0
Abstract: 

The Schwarz inequality and Jensen’s one are fundamental in a Hilbert space. Regarding a sesquilinear map B(X, Y ) = Y*X as an operatorvalued inner product, we discuss operator versions for the above inequalities and give simple conditions that the equalities hold.

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Author(s): 

ABDOLLAHPOUR M.R. | NAJATI A.

Issue Info: 
  • Year: 

    2011
  • Volume: 

    37
  • Issue: 

    4
  • Pages: 

    141-155
Measures: 
  • Citations: 

    0
  • Views: 

    455
  • Downloads: 

    181
Abstract: 

In this paper we introduce and study Besselian g-frames. We show that the kernel of associated synthesis operator for a Besselian g-frame is finite dimensional. We also introduce a-dual of a g-frame and we get some results when we use the Hilbert-Schmidt norm for the members of a g-frame in a finite dimensional Hilbert space.

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Writer: 

AHMADI R.

Issue Info: 
  • Year: 

    2016
  • Volume: 

    47
Measures: 
  • Views: 

    169
  • Downloads: 

    75
Abstract: 

WE GENERALIZED THE CONCEPT OF FUSION frameS, NAMELY, C-FUSION INTEGRAL, WHICH IS A CONTINUOUS VERSION OF THE FUSION frameS AND WE EXTENDED IT FOR GENERALIZED frameS. IN THIS ARTICLE WEGIVE SOME IMPORTANT PROPERTIES ABOUT IT NAMELY ERASURES OF SUBSPACES, THE BOUND OF GC−ERASURERECONSTRUCTION ERROR FOR PARSEVAL GC-frame OF SUBSPACES.

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