Advances of Linear and Multilinear Algebra

A special issue of Mathematics (ISSN 2227-7390). This special issue belongs to the section "Algebra, Geometry and Topology".

Deadline for manuscript submissions: closed (30 September 2024) | Viewed by 3579

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V.I.Romanovsky Institute of Mathematics of the Academy of Sciences of Uzbekistan, Tashkent, Uzbekistan
Interests: non-associative algebras; linear algebra; derivations; degenerations; classifications

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Dear Colleagues,

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Keywords

  • linear algebra
  • linear transformations
  • non-associative algebras
  • derivations of algebras
  • degenerations
  • deformations
  • classifications of algebras

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Published Papers (4 papers)

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Research

23 pages, 619 KiB  
Article
A System of Tensor Equations over the Dual Split Quaternion Algebra with an Application
by Liuqing Yang, Qing-Wen Wang and Zuliang Kou
Mathematics 2024, 12(22), 3571; https://doi.org/10.3390/math12223571 - 15 Nov 2024
Viewed by 333
Abstract
In this paper, we propose a definition of block tensors and the real representation of tensors. Equipped with the simplification method, i.e., the real representation along with the M-P inverse, we demonstrate the conditions that are necessary and sufficient for the system of [...] Read more.
In this paper, we propose a definition of block tensors and the real representation of tensors. Equipped with the simplification method, i.e., the real representation along with the M-P inverse, we demonstrate the conditions that are necessary and sufficient for the system of dual split quaternion tensor equations (ANX,XSC)=(B,D), when its solution exists. Furthermore, the general expression of the solution is also provided when the solution of the system exists, and we use a numerical example to validate it in the last section. To the best of our knowledge, this is the first time that the aforementioned tensor system has been examined on dual split quaternion algebra. Additionally, we provide its equivalent conditions when its Hermitian solution X=X and η-Hermitian solutions X=Xη exist. Subsequently, we discuss two special dual split quaternion tensor equations. Last but not least, we propose an application for encrypting and decrypting two color videos, and we validate this algorithm through a specific example. Full article
(This article belongs to the Special Issue Advances of Linear and Multilinear Algebra)
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28 pages, 408 KiB  
Article
On Lagrangian Grassmannian Variety and Plücker Matrices
by Jesús Carrillo-Pacheco
Mathematics 2024, 12(6), 858; https://doi.org/10.3390/math12060858 - 14 Mar 2024
Viewed by 876
Abstract
The Plücker matrix BL(n,E) of the Lagrangian Grassmannian L(n,E), is determined by the linear envelope L(n,E) of the Lagrangian Grassmannian. The linear envelope [...] Read more.
The Plücker matrix BL(n,E) of the Lagrangian Grassmannian L(n,E), is determined by the linear envelope L(n,E) of the Lagrangian Grassmannian. The linear envelope L(n,E) is the intersection of linear relations of Plücker of Lagrangian Grassmannian, defined here. The Plücker matrix BL(n,E) is a direct sum of the incidence matrix of the configuration of subsets. These matrices determine the isotropy index rn and rn-atlas which are invariants associated with the symplectic vector space E. Full article
(This article belongs to the Special Issue Advances of Linear and Multilinear Algebra)
16 pages, 275 KiB  
Article
A Representation of the Drazin Inverse for the Sum of Two Matrices and the Anti-Triangular Block Matrices
by Li Guo, Guangli Hu, Deyue Yu and Tian Luan
Mathematics 2023, 11(17), 3661; https://doi.org/10.3390/math11173661 - 24 Aug 2023
Viewed by 785
Abstract
In this paper, a new formula for the Drazin inverse for the Sum of Two Matrices is given under conditions weaker than those used in some current literature. Further, we apply our results to obtain new representations for the Drazin inverse of an [...] Read more.
In this paper, a new formula for the Drazin inverse for the Sum of Two Matrices is given under conditions weaker than those used in some current literature. Further, we apply our results to obtain new representations for the Drazin inverse of an anti-triangular block matrix under some conditions, which also extend some existing results. Full article
(This article belongs to the Special Issue Advances of Linear and Multilinear Algebra)
18 pages, 300 KiB  
Article
Parallel Sum of Bounded Operators with Closed Ranges
by Wenting Liang
Mathematics 2023, 11(13), 2897; https://doi.org/10.3390/math11132897 - 28 Jun 2023
Viewed by 870
Abstract
Let H be a separable infinite dimensional complex Hilbert space and B(H) be the set of all bounded linear operators on H. In this paper, we present several conditions under which the distributive law of the parallel sum is [...] Read more.
Let H be a separable infinite dimensional complex Hilbert space and B(H) be the set of all bounded linear operators on H. In this paper, we present several conditions under which the distributive law of the parallel sum is valid. It is proved that the parallel sum for positive operators with closed ranges is continued at 0. For A,BB(H) with closed ranges, it is proved that A¯B if and only if A and BA are parallel summable with the parallel sum A:(BA)=0, where the symbol “¯” denotes the minus partial order. Full article
(This article belongs to the Special Issue Advances of Linear and Multilinear Algebra)
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