AbstractWe establish lower bounds for norms and CB-norms of elementary operators on B(H). Our main result concerns the operator Ta,bx=axb+bxa and we show ‖Ta,b‖⩾‖a‖‖b‖, proving a conjecture of M. Mathieu. We also establish some other results and formulae for ‖Ta,b‖cb and ‖Ta,b‖ for special cases
In this paper we establish various inequalities between the operator norm and the numerical radius ...
We study essential norms of differences of composition operators on the Banach algebra H^∞ of bounde...
We study some properties of (,)-normal operators and we present various inequalities between the ope...
AbstractLet H be a complex Hilbert space and let B(H) denote the algebra of all bounded linear opera...
Abstract. Let B(H) and A be a C∗−algebra of all bounded linear operators on a complex Hilbert space ...
For two elements a and b of a ring A, we understand byMa,b the two-sided multiplication induced by a...
The norm of an elementary operator has been studied by many mathematicians. Varied results have been...
We investigate norms related to the vectors h n =(h n (k)) k ∈ℕ in ℝℕ (or ℂℕ) (n∈ℕ) where hn(k)=n!k...
Dedicated to Roger Horn on the occasion of his 65th birthday LetA be a standard operator algebra act...
We present several norm inequalities for Hilbert space operators. In particular, we prove that if A1...
AbstractWe present several norm inequalities for Hilbert space operators. In particular, we prove th...
Let H be a complex Hilbert space and let B(H) be the algebra of all bounded linear operators on H. F...
AbstractLet (E, ∥ ∥) be a Banach space and L(E) be the Banach algebra of all bounded linear operator...
AbstractIn this paper, we introduce Pexiderized generalized Jensen and Pexiderized generalized quadr...
We mainly consider the real or complex operator norms for real or complex matrices on finite dimensi...
In this paper we establish various inequalities between the operator norm and the numerical radius ...
We study essential norms of differences of composition operators on the Banach algebra H^∞ of bounde...
We study some properties of (,)-normal operators and we present various inequalities between the ope...
AbstractLet H be a complex Hilbert space and let B(H) denote the algebra of all bounded linear opera...
Abstract. Let B(H) and A be a C∗−algebra of all bounded linear operators on a complex Hilbert space ...
For two elements a and b of a ring A, we understand byMa,b the two-sided multiplication induced by a...
The norm of an elementary operator has been studied by many mathematicians. Varied results have been...
We investigate norms related to the vectors h n =(h n (k)) k ∈ℕ in ℝℕ (or ℂℕ) (n∈ℕ) where hn(k)=n!k...
Dedicated to Roger Horn on the occasion of his 65th birthday LetA be a standard operator algebra act...
We present several norm inequalities for Hilbert space operators. In particular, we prove that if A1...
AbstractWe present several norm inequalities for Hilbert space operators. In particular, we prove th...
Let H be a complex Hilbert space and let B(H) be the algebra of all bounded linear operators on H. F...
AbstractLet (E, ∥ ∥) be a Banach space and L(E) be the Banach algebra of all bounded linear operator...
AbstractIn this paper, we introduce Pexiderized generalized Jensen and Pexiderized generalized quadr...
We mainly consider the real or complex operator norms for real or complex matrices on finite dimensi...
In this paper we establish various inequalities between the operator norm and the numerical radius ...
We study essential norms of differences of composition operators on the Banach algebra H^∞ of bounde...
We study some properties of (,)-normal operators and we present various inequalities between the ope...
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