Volume 7, Issue 3 Dorian Popa Functional inclusions on square-symmetric grupoids and Hyers-Ulam stability 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 Dorian Popa Find more articles with the same keywords Hyers-Ulam stability set-valued map selection square-symmetric operation Find more articles with the same subject classes 39B72 54C60