Zobrazeno 1 - 10
of 202
pro vyhledávání: '"Heydar Radjavi"'
Publikováno v:
Linear Algebra and its Applications. 642:160-220
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f79edd99ddf1731827582416d072449
https://doi.org/10.1016/j.laa.2022.02.017
https://doi.org/10.1016/j.laa.2022.02.017
Publikováno v:
Proceedings of the American Mathematical Society. 149:4083-4097
We study the maximal algebraic degree of principal ortho-compressions of linear operators that constitute spatial matricial numerical ranges of higher order. We demonstrate (amongst other things) that for a (possibly unbounded) operator L L on a Hilb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed08dd7bdf5142a1b4657fdb0f49ed17
https://doi.org/10.1090/proc/15523
https://doi.org/10.1090/proc/15523
Publikováno v:
Journal of Functional Analysis. 284:109854
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::32c86f4aa2da4711c4046f467daf1d70
https://doi.org/10.1016/j.jfa.2023.109854
https://doi.org/10.1016/j.jfa.2023.109854
Publikováno v:
Linear Algebra and its Applications. 611:260-278
We explore the relationship between local and global reducibility of spaces of nilpotent matrices. By local reducibility we mean that small subspaces of a given irreducible linear space L ⊆ M n ( C ) are reducible. One of our main results is that f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ec29e137d1b59bc0e98c050b5f273f4
https://doi.org/10.1016/j.laa.2020.10.031
https://doi.org/10.1016/j.laa.2020.10.031
Publikováno v:
Operators and Matrices. :39-45
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1070f80b7c7fb15f610546d7c8c31c8
https://doi.org/10.7153/oam-2021-15-03
https://doi.org/10.7153/oam-2021-15-03
Publikováno v:
Studia Mathematica. 256:73-92
Let $\mathcal{H}$ be a complex, separable Hilbert space, and $\mathcal{B}(\mathcal{H})$ denote the set of all bounded linear operators on $\mathcal{H}$. Given an orthogonal projection $P \in \mathcal{B}(\mathcal{H})$ and an operator $D \in \mathcal{B
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b111cc2903418f4b599df69789a85bb3
https://doi.org/10.4064/sm190819-13-2
https://doi.org/10.4064/sm190819-13-2
Publikováno v:
Linear Algebra and its Applications. 607:58-88
Let n ∈ N , and consider C n equipped with the standard inner product. Let A ⊆ L ( C n ) be a unital algebra and P ∈ L ( C n ) be an orthogonal projection. The space L : = P ⊥ A | ran P is said to be an off-diagonal corner of A , and L is sai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f237db94d321e2a418733fcc87a89b97
https://doi.org/10.1016/j.laa.2020.07.036
https://doi.org/10.1016/j.laa.2020.07.036
Autor:
Heydar Radjavi, A. R. Sourour
Publikováno v:
Semigroup Forum. 102:274-287
We investigate the structure of the multiplicative semigroup generated by the set of matrices that are unitarily equivalent to a given invertible matrix A. In particular, we give necessary and sufficient conditions for such a semigroup to be the spec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::22cc124247a008649f304699be55bcab
https://doi.org/10.1007/s00233-020-10139-w
https://doi.org/10.1007/s00233-020-10139-w
Autor:
Heydar Radjavi, Don Hadwin
Publikováno v:
Linear Algebra and its Applications. 603:186-189
We give a short proof of a theorem of Mirsky on doubly substochastic matrices and prove generalizations.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad58ccdbf293142e336820945d6d2d94
https://doi.org/10.1016/j.laa.2020.05.031
https://doi.org/10.1016/j.laa.2020.05.031
Publikováno v:
Studia Mathematica. 252:93-103
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::230831858b99d01fe5efc90ab9245d15
https://doi.org/10.4064/sm190102-29-4
https://doi.org/10.4064/sm190102-29-4