Dragoljub J. Keckic

activity

20172025

collaborators

4 papers

math.FA2025

Clarkson-McCarthy inequality on a locally compact group

Dragoljub J. Kečkić, Zlatko Lazović

Let $G$ be a locally compact group, $μ$ its Haar measure, $G^$ its Pontryagin dual and $ν$ the dual measure. For any $A_{θ} \in L^{1} (G; C_{p}) \cap L^{2} (G; C_{p})$ , ($\ma…

math.OA2024

Measures of noncompactness in Hilbert $C^{*}$ -modules

Dragoljub J. Kečkić, Zlatko Lazović

Consider a countably generated Hilbert $C^{*}$ -module $M$ over a $C^{*}$ -algebra $A$ . There is a measure of noncompactness $λ$ defined, roughly as the distance from f…

math.FA2018

The applications of Cauchy-Schwartz inequality for Hilbert modules to elementary operators and i.p.t.i. transformers

Dragoljub J. Kečkić

We apply the inequality $∣ ⟨ x, y ⟩ ∣ \leq ∥ x ∥ ⟨ y, y ⟩^{1/2}$ to give an easy and elementary proof of many operator inequalities for elementary operators…

math.OA2017

Measures of noncompactness on the standard Hilbert $C^{*}$ -module

Dragoljub J. Kečkić, Zlatko Lazović

We define a measure of noncompactness $λ$ on the standard Hilbert $C^{*}$ -module $l^{2} (A)$ over a unital $C^{*}$ -algebra, such that $λ (E) = 0$ if and only if $E$ is $A$ -…

Clarkson-McCarthy inequality on a locally compact group

Measures of noncompactness in Hilbert C∗-modules

The applications of Cauchy-Schwartz inequality for Hilbert modules to elementary operators and i.p.t.i. transformers

Measures of noncompactness on the standard Hilbert C∗-module

Measures of noncompactness in Hilbert $C^{*}$ -modules

Measures of noncompactness on the standard Hilbert $C^{*}$ -module