Volume 4, Issue 4 Jaspal Singh Aujla Perturbation bounds for certain operator functions 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 Jaspal Singh Aujla Find more articles with the same keywords Positive operator operator monotone function unitarily invariant norm Find more articles with the same subject classes 47A30 47B15 15A60