AbstractWe prove an inequality related to polynomial functions of a square matrix, involving the numerical range of the matrix. We also show extensions valid for bounded and also unbounded operators in Hilbert spaces, which allow the development of a functional calculus
We study the relations between a Hilbert space operator and the numerical ranges of its powers in th...
Let B(H) denote the C^*-algebra of all bounded linear operators on a complex Hilbert space H. For A ...
Abstract. This is an introduction to the notion of numerical range for bounded linear operators on H...
AbstractWe prove an inequality related to polynomial functions of a square matrix, involving the num...
International audienceWe prove an inequality related to polynomial functions of a square matrix, inv...
International audienceWe develop a functional calculus for both bounded and unbounded operators in H...
AbstractThe numerical range W(A) of a bounded linear operator A on a Hilbert space is the collection...
AbstractLet T be a linear operator on a complex Hilbert space with numerical radius bounded by one. ...
AbstractIn this note, a new characterization of an attained boundary point of the numerical range of...
Let (H,< .,. >) be a complex Hilbert space and B(H) denote the C-algebra of all bounded linear...
The numerical range W(A) of a bounded linear operator A on a Hilbert space is the collection of comp...
The numerical range W(A) of a bounded linear operator A on a Hilbert space is the collection of comp...
Pokazano je, da lahko linearno odvisnost dveh operatorjev na Hilbertovem prostoru preverimo s pomočj...
AbstractSome inequalities for the numerical radius, the operator norm and the maximum of the real pa...
International audienceIn an attempt to progress towards proving the conjecture the numerical range W...
We study the relations between a Hilbert space operator and the numerical ranges of its powers in th...
Let B(H) denote the C^*-algebra of all bounded linear operators on a complex Hilbert space H. For A ...
Abstract. This is an introduction to the notion of numerical range for bounded linear operators on H...
AbstractWe prove an inequality related to polynomial functions of a square matrix, involving the num...
International audienceWe prove an inequality related to polynomial functions of a square matrix, inv...
International audienceWe develop a functional calculus for both bounded and unbounded operators in H...
AbstractThe numerical range W(A) of a bounded linear operator A on a Hilbert space is the collection...
AbstractLet T be a linear operator on a complex Hilbert space with numerical radius bounded by one. ...
AbstractIn this note, a new characterization of an attained boundary point of the numerical range of...
Let (H,< .,. >) be a complex Hilbert space and B(H) denote the C-algebra of all bounded linear...
The numerical range W(A) of a bounded linear operator A on a Hilbert space is the collection of comp...
The numerical range W(A) of a bounded linear operator A on a Hilbert space is the collection of comp...
Pokazano je, da lahko linearno odvisnost dveh operatorjev na Hilbertovem prostoru preverimo s pomočj...
AbstractSome inequalities for the numerical radius, the operator norm and the maximum of the real pa...
International audienceIn an attempt to progress towards proving the conjecture the numerical range W...
We study the relations between a Hilbert space operator and the numerical ranges of its powers in th...
Let B(H) denote the C^*-algebra of all bounded linear operators on a complex Hilbert space H. For A ...
Abstract. This is an introduction to the notion of numerical range for bounded linear operators on H...