Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Hosseinzadeh, Roja"'
Autor:
Hosseinzadeh, Roja, Petek, Tatjana
Let $\mathcal{X}$ be a real or complex Banach space with $ \dim \mathcal{X}\geq 3$. We give a complete description of surjective mappings on $\mathcal{B(X)}$ that preserve the ascent of Jordan triple product of operators or, preserve the descent of J
Externí odkaz:
http://arxiv.org/abs/2402.19130
Autor:
Hosseinzadeh, Roja
Let $\mathcal{A}$ and $\mathcal{B}$ be standard operator algebras on Banach spaces $\mathcal{X}$ and $\mathcal{Y}$, respectively. In this paper, we show that every bijection completely preserving quadratic operators from $\mathcal{A}$ onto $\mathcal{
Externí odkaz:
http://arxiv.org/abs/2012.02528
Autor:
Hosseinzadeh, Roja, Petek, Tatjana
Publikováno v:
In Linear Algebra and Its Applications 15 August 2023 671:109-120
Autor:
Taghavi, Ali, Hosseinzadeh, Roja
In this paper, we extend the definition of hyperinner product defined on weak hypervector spaces with a hyperoperation scalar product to weak hypervector spaces with the hyperoperations sum and scalar products.
Comment: 9 pages
Comment: 9 pages
Externí odkaz:
http://arxiv.org/abs/1601.00888
Autor:
Taghavi, Ali, Hosseinzadeh, Roja
Let X and Y be Banach spaces with dim X greater than 3. Let A and B be standard operator algebras on X and Y. We characterize the form of maps from A onto B such that completely preserve involution.
Comment: 10 pag3s
Comment: 10 pag3s
Externí odkaz:
http://arxiv.org/abs/1311.6974
Autor:
Taghavi, Ali, Hosseinzadeh, Roja
Let H and K be infinite dimensional Hilbert spaces, while B(H) and B(K) denote the algebras of all linear bounded operators on H and K, respectively. We characterize the forms of additive mappings from B(H) into B(K) that preserve the nonzero idempot
Externí odkaz:
http://arxiv.org/abs/1309.4220
Autor:
Taghavi, Ali, Hosseinzadeh, Roja
Let H be a complex Hilbert space, B(H) and S(H) be the spaces of all bounded operators and all self-adjoint operators on H, respectively. We give the concrete forms of the maps on B(H) and also S(H) which preserve the spectrum of certain products of
Externí odkaz:
http://arxiv.org/abs/1309.4032
In this paper, we introduce the concept of inner product on weak hypervector spaces and prove some results about them.
Comment: 7 pages
Comment: 7 pages
Externí odkaz:
http://arxiv.org/abs/1309.3629
Autor:
Taghavi, Ali, Hosseinzadeh, Roja
Let B(X) be the algebra of all bounded linear operators on a complex Banach space X with dim X greater than 3. In this paper, we characterize the forms of surjective linear maps on B(X) which preserve the dimension of the vector space containing of a
Externí odkaz:
http://arxiv.org/abs/1309.3429
Let $X$ be a complex Banach space with $\dim X\geq3$ and $B(X)$ the algebra of all bounded linear operators on $X$. Suppose $\phi:B(X)\longrightarrow B(X)$ is a surjective map satisfying the following property: $Fix(AB)=Fix(\phi(A)\phi(B)), (A, B\in
Externí odkaz:
http://arxiv.org/abs/1308.3562