(∫x1 x0) F(x,y,y′,y",y"′)dx型泛函的可动边界问题
(∫x1 x0) F(x,y,y′,y",y"′)dx형범함적가동변계문제
The Varial Boundary Problem of Extensive Function about (∫x1 x0)F ( x, y,y′,y″,y"′)dx