Volume 8, Issue 1 Sanaa Messirdi Bekkai Messirdi Miloud Messirdi On different concepts of closedness of linear 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 Sanaa Messirdi Bekkai Messirdi Miloud Messirdi Find more articles with the same keywords almost closed extensions almost closable operators sums products limits integrals locally convex Hausdorff topology Find more articles with the same subject classes 47A05 47B33