Volume 17, Issue 1 Soumia Soltani Abdelkader Frakis Further refinements of some numerical radius inequalities for operators Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Soumia Soltani Abdelkader Frakis Find more articles with the same keywords normal operator self-adjoint operator operator norm spectral radius Find more articles with the same subject classes 47A12 47A30 47B15