方程(dx/dt)=x~n+sum from i=0 to (n-1) a_i(t)x~2的闭解的个数及存在的条件

李今明

THE CONDITIONS OF EXISTENCE AND THE NUMBER FOR THE CLOSED SOLUTIONS OF THE EQUATION ■

LI JINMING; CAI SUILIN

应用数学学报 . 1997, (1): 0 -0 . DOI: 10.12387/C1997005