Volume 15, Issue 4 Jian Liu Proof of a double inequality in triangles 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 Jian Liu Find more articles with the same keywords triangle Euler's inequality Gerretsen's inequality Sondat's inequality Ciamberlini's inequality Walker's inequality Find more articles with the same subject classes 51M16