In this paper the structure of integral surfaces near a higher order focus and saddle,of ordinary differential equations in complex domain is studied by reducing to the normal form system.The formulae of the normal fo...In this paper the structure of integral surfaces near a higher order focus and saddle,of ordinary differential equations in complex domain is studied by reducing to the normal form system.The formulae of the normal form system are also given.展开更多
文摘In this paper the structure of integral surfaces near a higher order focus and saddle,of ordinary differential equations in complex domain is studied by reducing to the normal form system.The formulae of the normal form system are also given.
