Journal of Mathematical Inequalities · Volume 13, Issue 4 A proof of Hilbert's theorem on ternary quartic forms 13-71 Pages 1001-1009 DOI 10.7153/jmi-2019-13-71 Downloads Short PDF Full PDF PNG Authors Jia Xu Yong Yao Keywords Hilbert's theorem positive semi-definite ternary quartic forms sum of squares the ladder technique Subject classes 11E25 14P05