Volume 6, Issue 3 J. William Helton Ilya M. Spitkovsky The possible shapes of numerical ranges 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 J. William Helton Ilya M. Spitkovsky Find more articles with the same keywords numerical range linear matrix inequalities Find more articles with the same subject classes 47A12