Mathematical Inequalities & Applications · Volume 23, Issue 4 Euler-Lagrange equations associated with extremal functions of several nonlocal inequalities 23-90 Pages 1165-1177 DOI 10.7153/mia-2020-23-90 Downloads Short PDF Full PDF PNG Authors Yayun Li Keywords Hardy-Littlewood-Sobolev inequality Gagliardo-Nirenberg inequality Coulomb-Sobolev inequality Euler-Lagrange equation Subject classes 26D10 26A33 35A23