称(x2y)在区域D上对y满足 Lipschitz 条件是指: 彐L>Os,t f(x, yi)-f(x,y2<Ly-y2 Vx∈[a,b],y,y2∈[e,d称f(x,y)在区域D上对y满足Lipschitz 条件是指: 1 2 1 2 1 2 0 . . ( , ) ( , ) , [ , ], , [ , ] L s t f x y f x y L y y x a b y y c d   −  −   