Volume 15, Issue 4 El Hassan Benabdi M. Barraa M. K. Chraibi Abderrahim Baghdad Maximal numerical range and quadratic elements in a C✻-algebra 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 El Hassan Benabdi M. Barraa M. K. Chraibi Abderrahim Baghdad Find more articles with the same keywords quadratic operator C✻-algebra numerical range maximal numerical range Find more articles with the same subject classes 46L05 47A12 47A63