Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Ali Armandnejad"'
Publikováno v:
Sahand Communications in Mathematical Analysis, Vol 3, Iss 2, Pp 91-106 (2016)
In this paper, we study some kinds of majorizations on $textbf{M}_{n}$ and their linear or strong linear preservers. Also, we find the structure of linear or strong linear preservers which are multiplicative, i.e. linear or strong linear preserver
Externí odkaz:
https://doaj.org/article/70da4ffe392f4cbd96ad1d384611fe64
Autor:
Ali Armandnejad, Leila Fazlpar
Publikováno v:
Czechoslovak Mathematical Journal. :1-12
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a61dcabe8d8352caae143177c0e946a
https://doi.org/10.21136/cmj.2023.0440-22
https://doi.org/10.21136/cmj.2023.0440-22
Publikováno v:
Operators and Matrices. :251-263
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84902656c6347bfdf54e147ba44c480a
https://doi.org/10.7153/oam-2022-16-20
https://doi.org/10.7153/oam-2022-16-20
Publikováno v:
Special Matrices. 11
Let M n {{\bf{M}}}_{n} be the set of all n × n n\times n real matrices. A nonsingular matrix A ∈ M n A\in {{\bf{M}}}_{n} is called a G-matrix if there exist nonsingular diagonal matrices D 1 {D}_{1} and D 2 {D}_{2} such that A − T = D 1 A D 2 {A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90e9b5a479585f30a3b77b18388bb68b
https://doi.org/10.1515/spma-2022-0178
https://doi.org/10.1515/spma-2022-0178
Autor:
Ali Armandnejad, Abbas Askarizadeh
Publikováno v:
Czechoslovak Mathematical Journal. 71:743-754
An m × n matrix R with nonnegative entries is called row stochastic if the sum of entries on every row of R is 1. Let Mm,n be the set of all m × n real matrices. For A, B ∈ Mm,n, we say that A is row Hadamard majorized by B (denoted by A ≺ RHB)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::946838dae7131360504028075d0fee12
https://doi.org/10.21136/cmj.2020.0081-20
https://doi.org/10.21136/cmj.2020.0081-20
Autor:
Abbas Askarizadeh, Ali Armandnejad
Publikováno v:
Bulletin of the Iranian Mathematical Society. 46:625-634
Let $${\mathbf {M}}_{n,m}$$ be the set of all n-by-m real matrices and let the relation $$\prec $$ on $${\mathbf {M}}_{n,m}$$ be the multivariate majorization. A linear mapping $$\Phi \!:{\mathbf {M}}_{n,m}\longrightarrow {\mathbf {M}}_{n,m}$$ is sai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc1f85e8f0b528aee20a81f79f44f338
https://doi.org/10.1007/s41980-019-00280-w
https://doi.org/10.1007/s41980-019-00280-w
Autor:
Farzaneh Akbarzadeh, Ali Armandnejad
Publikováno v:
Czechoslovak Mathematical Journal. 69:1111-1121
Let $$\mathbb{M}_{n,m}$$ be the set of all n × m real or complex matrices. For A, B ∈ $$\mathbb{M}_{n,m}$$, we say that A is row-sum majorized by B (written as A ≺rsB) if R(A) ≺ R(B), where R(A) is the row sum vector of A and ≺ is the classi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::352dc61650145906c5e9df3153ee98a5
https://doi.org/10.21136/cmj.2019.0084-18
https://doi.org/10.21136/cmj.2019.0084-18
Publikováno v:
Linear and Multilinear Algebra. 69:438-447
This paper is a continuation of the article ‘Topological properties of J-orthogonal matrices’, Linear and Multilinear Algebra 66(2018), 2524–2533, by the authors. Let Mn be the set of all n×n real ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a00532b3de59289f3c583a2b0c79efd
https://doi.org/10.1080/03081087.2019.1601667
https://doi.org/10.1080/03081087.2019.1601667
Publikováno v:
Bulletin of the Iranian Mathematical Society. 44:969-976
Let $$\mathbf M _{m,n}$$ be the set of all $$m\times n$$ real matrices. A matrix $$A\in \mathbf M _{m,n}$$ is said to be a dense matrix if there are no zeros between two nonzero entries for every line (row or column) of this matrix. In this paper, we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c634fcc6facc9a6bf5b4ba89d3808ad5
https://doi.org/10.1007/s41980-018-0063-4
https://doi.org/10.1007/s41980-018-0063-4
Publikováno v:
Linear and Multilinear Algebra. 66:2524-2533
In this paper the set of all J-orthogonal matrices is considered and some interesting properties of these matrices are obtained. The main topic is a straightforward proof of the known topol...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97b8f1d754027ef136b9af8f7acf7fc3
https://doi.org/10.1080/03081087.2017.1406447
https://doi.org/10.1080/03081087.2017.1406447