AbstractLet F(A) be the numerical range or the numerical radius of a square matrix A. Denote by A∘B the Schur product of two matrices A and B. Characterizations are given for mappings on square matrices satisfying F(A∘B)=F(ϕ(A)∘ϕ(B)) for all matrices A and B. Analogous results are obtained for mappings on Hermitian matrices
AbstractLet M be the complex linear space Mn of n × n complex matrices or the real linear space Hn o...
Let Cn×n and Hn denote respectively the space of n×n complex matrices and the real space of n×n herm...
[[abstract]]Let and denote respectively the space of n×n complex matrices and the real space of n×...
AbstractLet F(A) be the numerical range or the numerical radius of a square matrix A. Denote by A∘B ...
AbstractLet bdM be Hn or Cn×n, the real linear space of all n × n hermitian matrices and the complex...
V članku so karakterizirane linearne preslikave na tenzorskem produktu kompleksnih matrik, ki ohranj...
Let R be a proper subset of the complex plane, and let SR be the set of n × n complex matrices A suc...
Abstract. Every norm on Cn induces two norm numerical ranges on the algebra Mn of all n n complex ...
Let m, n ≥ 2 be positive integers. Denote by Mm the set of m × m complex matrices and by w (X) the n...
AbstractLet Cn×n and Hn denote respectively the space of n×n complex matrices and the real space of ...
AbstractLet Mn+ be the set of entrywise nonnegative n×n matrices. Denote by r(A) the spectral radius...
AbstractDenote the joint numerical radius of an m-tuple of bounded operators A=(A1,…,Am) by w(A). We...
AbstractLet Cn×n and Hn denote respectively the space of n×n complex matrices and the real space of ...
Let ϕ be a surjective map on the space of n×n complex matrices such that r(ϕ(A)-ϕ(B))=r(A-B) for all...
AbstractGiven m×n matrices A=[ajk] and B=[bjk], their Schur product is the m×n matrix A∘B=[ajkbjk]. ...
AbstractLet M be the complex linear space Mn of n × n complex matrices or the real linear space Hn o...
Let Cn×n and Hn denote respectively the space of n×n complex matrices and the real space of n×n herm...
[[abstract]]Let and denote respectively the space of n×n complex matrices and the real space of n×...
AbstractLet F(A) be the numerical range or the numerical radius of a square matrix A. Denote by A∘B ...
AbstractLet bdM be Hn or Cn×n, the real linear space of all n × n hermitian matrices and the complex...
V članku so karakterizirane linearne preslikave na tenzorskem produktu kompleksnih matrik, ki ohranj...
Let R be a proper subset of the complex plane, and let SR be the set of n × n complex matrices A suc...
Abstract. Every norm on Cn induces two norm numerical ranges on the algebra Mn of all n n complex ...
Let m, n ≥ 2 be positive integers. Denote by Mm the set of m × m complex matrices and by w (X) the n...
AbstractLet Cn×n and Hn denote respectively the space of n×n complex matrices and the real space of ...
AbstractLet Mn+ be the set of entrywise nonnegative n×n matrices. Denote by r(A) the spectral radius...
AbstractDenote the joint numerical radius of an m-tuple of bounded operators A=(A1,…,Am) by w(A). We...
AbstractLet Cn×n and Hn denote respectively the space of n×n complex matrices and the real space of ...
Let ϕ be a surjective map on the space of n×n complex matrices such that r(ϕ(A)-ϕ(B))=r(A-B) for all...
AbstractGiven m×n matrices A=[ajk] and B=[bjk], their Schur product is the m×n matrix A∘B=[ajkbjk]. ...
AbstractLet M be the complex linear space Mn of n × n complex matrices or the real linear space Hn o...
Let Cn×n and Hn denote respectively the space of n×n complex matrices and the real space of n×n herm...
[[abstract]]Let and denote respectively the space of n×n complex matrices and the real space of n×...
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