Volume 3, Issue 4 Amiran Gogatishvili Luboš Pick Duality principles and reduction theorems 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 Amiran Gogatishvili Luboš Pick Find more articles with the same keywords duality principles rearrangement-invariant spaces classical Lorentz spaces reduction theorems non-increasing functions Boyd indices Hardy averaging operator kernel integral operators Find more articles with the same subject classes 46E30 26D10