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Issue Info: 
  • Year: 

    2013
  • Volume: 

    7
  • Issue: 

    1
  • Pages: 

    41-58
Measures: 
  • Citations: 

    0
  • Views: 

    379
  • Downloads: 

    128
Abstract: 

Let B(X, Y) denote the set of all bounded linear OPERATORS from Banach space X to Banach space Y. In this paper, we introduce the concepts of LEFT and right DECOMPOSABLY regular OPERATORS, LEFT and right DECOMPOSABLY FREDHOLM OPERATORS in the setting of B(X, Y), and the corresponding holomorphic versions in the setting of B(X). By using Harte's techniques, we obtain various characterizations of these classes of OPERATORS. As the applications of these characterizations, we can compute the topological interiors and closures of them.

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Issue Info: 
  • Year: 

    2025
  • Volume: 

    20
  • Issue: 

    2
  • Pages: 

    31-39
Measures: 
  • Citations: 

    0
  • Views: 

    1
  • Downloads: 

    0
Abstract: 

In this paper we characterize FREDHOLM and invertible composition OPERATORS on harmonic Bloch function spaces. Indeed, we provide some necessary and sufficient conditions for FREDHOLMness of composition OPERATORS. Also, we investigate the relation between the FREDHOLM and invertible composition OPERATORS on harmonic Bloch function spaces.

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Writer: 

SHARIFI KAMRAN

Issue Info: 
  • Year: 

    2016
  • Volume: 

    4
Measures: 
  • Views: 

    157
  • Downloads: 

    87
Keywords: 
Abstract: 

WE BRIEY REVIEW SOME PROBLEM CONCERNING THE KTHEORY OF C*-ALGEBRAS AND PRO-C*-ALGEBRAS. IF A IS A PRO-C*- ALGEBRA THEN THE HOMOTOPY CLASSES OF A-KASPAROV CYCLES AND A- FREDHOLM OPERATORS ARE ISOMORPHIC WHICH ENABLES US TO ND A MILNOR LIM1 EXACT SEQUENCE FOR HOMOTOPY GROUPS OF FREDHOLM OPERATORS.

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Issue Info: 
  • Year: 

    2025
  • Volume: 

    15
  • Issue: 

    1
  • Pages: 

    1-13
Measures: 
  • Citations: 

    0
  • Views: 

    10
  • Downloads: 

    0
Abstract: 

In this paper we consider WCT OPERATORS on Orlicz spacess. Then we provide necessary and sufficient condition for WCT OPERATORS between two Orlicz spaces to have closed range. Also, we investigate FREDHOLM WCT OPERATORS.In this paper we consider WCE OPERATORS on Orlicz spacess. Then we provide necessary and sufficient condition for WCT OPERATORS between two Orlicz spaces to have closed range. Also, we investigate FREDHOLM WCT OPERATORS.

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Issue Info: 
  • Year: 

    2016
  • Volume: 

    4
Measures: 
  • Views: 

    147
  • Downloads: 

    54
Keywords: 
Abstract: 

IN THIS PAPER WE INVESTIGATE STRONG DEPENDENCE OF CONTINUITY OF A SEMIGROUP OF BOUNDED LINEAR OPERATORS TO THE ONEPARAMETER SEMIGROUP OF THEIR LEFT MULTIPLICATION OPERATORS.

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Issue Info: 
  • Year: 

    2013
  • Volume: 

    44
Measures: 
  • Views: 

    172
  • Downloads: 

    86
Abstract: 

FOR A, B Î MNM, WE SAY A IS LEFT MATRIX MAJORIZED BY B AND WRITE (FORMULA) FOR SOME ROW STOCHASTIC MATRIX R. A LINEAR OPERATOR T: MNM® MNM IS SAID TO BE A LINEAR PRESERVER OF (FORMULA) IMPLIES THAT TA<L TB: LINEAR PRESERVERS OF -ℓ ARE CHARACTERIZED. HERE, WE EXTEND THE RESULT TO THE CASE T IS A LINEAR OPERATOR FROM MNM TO MNQ, WHERE M AND Q ARE NOT NECESSARILY IDENTICAL.

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Author(s): 

ABDMOULEH FAICAL

Issue Info: 
  • Year: 

    2014
  • Volume: 

    40
  • Issue: 

    5
  • Pages: 

    1057-1066
Measures: 
  • Citations: 

    0
  • Views: 

    427
  • Downloads: 

    186
Abstract: 

In this paper, we show the stability of Gustafson, Wei-dmann, Kato, Wolf, Schechter and Browder essential spectrum of bounded linear OPERATORS on Banach spaces which remain invari-ant under additive perturbations belonging to a broad classes of OPERATORS U such that g(Um)<1 where g(.) is a measure of non-compactness.

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Author(s): 

Sun X. R. | LIU H.W.

Issue Info: 
  • Year: 

    2020
  • Volume: 

    17
  • Issue: 

    3
  • Pages: 

    103-116
Measures: 
  • Citations: 

    0
  • Views: 

    353
  • Downloads: 

    147
Abstract: 

Recently the distributive equations involving various classes of aggregation OPERATORS have aroused widespread attention because of their importance in the theoretic and applied communities of fuzzy set theory. 2-uninorms and semi-t-OPERATORS are two special classes of aggregation OPERATORS and have been proved to be useful in many areas such as fuzzy decision making, approximate reasoning and so on. Therefore, the aim of this paper is to investigate the LEFT (right) distributivity of semi-t-OPERATORS over 2-uninorms. We consider five subclasses of 2-uninorms and characterize the corresponding LEFT (right) distributive equations of semi-t-OPERATORS over 2-uninorms.

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Issue Info: 
  • Year: 

    2023
  • Volume: 

    12
  • Issue: 

    1
  • Pages: 

    289-310
Measures: 
  • Citations: 

    0
  • Views: 

    30
  • Downloads: 

    3
Abstract: 

The fundamental concept of statistical convergence first was put forward by Steinhaus and at the same time but also  by Fast \cite{Fast} independently both for complex and real sequences. In fact, the convergence in terms of statistical     manner can be seen as a generalized form of the common convergence notion that is in the parallel of the theory of usual convergence. Measuring how large a subset of the set of natural number can be possible by means of asymptotic    density. It is intuitively known that positive integers are in fact far beyond the fact that they are perfect squares. This is due to the fact that each perfect square is positive and besides at the same time there are many other positive integers. But it is also known that the set consisting of integers which are positive is not larger than that of those which are perfect squares: both of those sets are countable and infinite and therefore can be considered in terms of $1$-to-$1$ correspondence. However, when the natural numbers are scanned for increasing order, then the squares are seen     increasingly scarcity. It is at this point that the concept of natural density comes into out help and this intuition becomes more precise. In this study, the above mentioned statistical convergence and asymptotic density concepts are     examined in a new space and an attempt is made to fill a gap in the literature as follows. Stancu type extension of the widely known Chlodowsky type \linebreak$\LEFT( \lambda,q\right)  $-OPERATORS is going to be introduced. Moreover, the    description of the novel rough statistical convergence having Pascal Fibonacci binomial matrix is going to be presented and several general characteristics of rough statistical convergence are taken into consideration. In the second place, the approximation theory is investigated as the rate of the rough statistical convergence of Chlodowsky type $\LEFT(\lambda,q\right)$-OPERATORS.

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Journal: 

MATHEMATICAL SCIENCES

Issue Info: 
  • Year: 

    2012
  • Volume: 

    6
  • Issue: 

    -
  • Pages: 

    1-8
Measures: 
  • Citations: 

    0
  • Views: 

    303
  • Downloads: 

    88
Abstract: 

For a sequence of Hilbert spaces and continuous linear OPERATORS, the curvature is defined to be the composition of any two consecutive OPERATORS. This is modeled on the de Rham resolution of a connection on a module over an algebra.Purpose: We wish to study those sequences for which the curvature is ‘small’ at each step, e.g., belongs to a fixed operator ideal.Methods: Our methods are based on combining homological algebra with the theory of FREDHOLM OPERATORS in Hilbert spaces.Results: We elaborate the theory of FREDHOLM sequences and show that any FREDHOLM sequence of trace class curvature can be reduced to a FREDHOLM complex. This allows one to introduce the Lefschetz number for cochain self-mappings of FREDHOLM sequences of ‘small’ curvature.Conclusion: Our results raise fixed point theory for FREDHOLM complexes of trace class curvature.

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