Volume 5, Issue 1 Wai-Shun Cheung Xuhua Liu Tin-Yau Tam Multiplicities, boundary points, and {joint} 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 Wai-Shun Cheung Xuhua Liu Tin-Yau Tam Find more articles with the same keywords joint numerical range multiplicity extreme point sharp point boundary point Find more articles with the same subject classes 15A60