Volume 14, Issue 2 B. P. Duggal In Hyoun Kim On power Drazin normal and Drazin quasi-normal Hilbert space 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 B. P. Duggal In Hyoun Kim Find more articles with the same keywords Drazin invertible operator structure of [(n,m)DN] operators n-th root of normal operator commutativity theorem Find more articles with the same subject classes 47A15 47B15 47B20