摘要
就微分形式P(x,y,z)dx+Q(x,y,z)dy+R(x,y,z)dz为某函数u(x,y,z)的全微分的积分因子进行了探讨,提出了积分因子的必要条件,以及P(x,y,z),Q(x,y,z),R(x,y,z)是齐次函数时,方程Pdx+Qdy+Rdz=0具有积分因子的充分条件进行了初步探讨.
This paper discusses the necessary conditions for differential form P(x ,y, z) dx+ Q(x, y, z) dy+ R(x, y, z) dz to be a whole differential scoring factor of a function u(x,y,z). Preliminary discussion has also made to find the necessary condition for the scoring factor of the function Pdx+Qdy+Rdz=0 when P(x,y,z) ,Q(x,y,z) ,R(x,y,z) are homogeneous functions.
出处
《大学数学》
北大核心
2008年第4期165-168,共4页
College Mathematics
关键词
全微分
积分因子
旋度
正交
齐次函数
differential equation
integral factor
rotation
orthogonal
homogeneous function