【摘要】 证明(dy)/(dx)=ky+f(x),k为常数,f(x+ω)=f(x),有一个ω为周期的特解;然后推广以k为函数的情形最后推广到方程组。更多还原

【Abstract】 A Liapounoff’s theorem is proved and extended to that equation with periodic coefficient. Finally, the theorem is extended to linear differential equation systems with periodic coefficients.更多还原