关于一阶线性常微分方程常数变易法的一点注记

文章通过初步说明、深入研究、精确推导三个层次 ,说明了一阶线性常微分方程的常数变易法中把任意常数 C变易成函数 u( x)

Through preliminary analysis, thorough study and elaborate deduction, the author elucidated the necessity of replacing constant C with function c(x) in solving linear ordinary differential equation of the first order.\;