At the same time the new algorithm is applied to find necessary conditions for such isochronous center, then proofs of isochronicity of these systems by using some effective methods are given.
At the same time the new algorithm is applied to find necessary conditions for such isochronous center, then proofs of isochronicity of these systems by using some effective methods are given.
同时通过一种最新算法求出无穷远点为中心时的周期常数，得到了拟等时中心的必要条件，并利用一些有效途径一一证明了条件的充分性。