Volume 11, Issue 3 Jor-Ting Chan Kong Chan An observation about normaloid 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 Jor-Ting Chan Kong Chan Find more articles with the same keywords numerical range normaloid Davis-Wielandt shell Find more articles with the same subject classes 47A12 47B20