– belgisiz funkciyalardıń tuwındılarına qarata sheshilgen $$\left\{ \begin{array}{l}\dfrac{dy_1}{dx}=f_1(x,y_1,y_2,\ldots,y_n), \\\dfrac{dy_2}{dx}=f_2(x,y_1,y_2,\ldots,y_n), \\\cdots\cdots\cdots\cdots\cdots\cdots\cdots\cdots \\\dfrac{dy_n}{dx}=f_n(x,y_1,y_2,\ldots,y_n) \\\end{array}\right.$$ túrindegi sistema, bunda $x$ - ǵárezsiz ózgeriwshi, $y_1, y_2,\ldots, y_n$ - belgisiz funkciyalar, $f_1, f_2,\ldots, f_n$ - berilgen funkciyalar.