Volume 24, Issue 2 Maryam Amyari Marzieh Moradian Khibary Approximate ω-orthogonality and ω-derivation 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 Maryam Amyari Marzieh Moradian Khibary Find more articles with the same keywords Hilbert space numerical radius approximate ω-orthogonality ω-derivation Find more articles with the same subject classes 47A12 46B20 46C05