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不变曲线 [bù biàn qū xiàn]
[数] invariant curve
- 给出一平面五次多项式微分系统存在五次代数不变曲线的条件。
The conditions of one family of planar quintic polynomial differential system which(possesses) a quintic algebraic invariant curve are presented. - 证明了当时间步长充分小时，辛算法可以保持原系统的大部分不变闭曲线，而非辛算法却做不到这一点。
We prove that symplectic algorithms may keep most of the invariant curves of Duffing equation when the time-step is small enough but non-symplectic algorithms cannot. - 给出一类与已有结果不同的二次系统的五次不变代数曲线，其非孤立闭分支在一定条件下构成系统的同宿环。
A kind of quintic curve homoclinic cycles of a quadratic system are found, which are different from the ones described before.
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