Article
Keywords:
integrating factor
Summary:
The problem of integrating factor for ordinary differential equations is investigated. Conditions are given which guarantee that each solution of $\partial_1F(x,y)+y'\partial_2F(x,y)=0$ is also a solution of $M(x,y)+y'N(x,y)=0$ where $\partial_1F=\mu M$ and $\partial_2F=\mu N$.