existence of positive solution for a biharmonic equation
xie chaodong (college of economic and management; guizhou university for ethnic minorities; guiyang 550025} yao yangxin yang jun (dept. of appl. math.; south china university of technology; guangzhou 510640)
the instability of a differential equation with odd order
ruan jiong jin chunyan ruan qing (research center and laboratory of mathematics for nonlinear science; dept. and institute of mathematics; fudan university; shanghai 200433)