Volume 1, Issue 2 B. P. Duggal Spectral continuity of k-th roots of hyponormal 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 Find more articles with the same keywords Hilbert space classes of operators continuity of the spectrum Find more articles with the same subject classes 47B20 47A10 47A11