Volume 9, Issue 1 Cristina Diogo Algebraic properties of the set of operators with 0 in the closure of the numerical range 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 Cristina Diogo Find more articles with the same keywords numerical range Find more articles with the same subject classes 47A12