不存在不变代数曲线的平面向量场
Planar vector fields without invariant algebraic curves
AI总结:
本文拓展了检测平面多项式向量场不变代数曲线不存在性的方法,证明相关向量场空间的测度性质,将其应用于Kolmogorov向量场,并细化了希尔伯特第十六问题的相关结论。
摘要:
本文重新研究并拓展了Lins Neto、Sad与Scárdua提出的方法,该方法用于检测除给定不变结点曲线外不存在其他不变代数曲线的情况。我们证明,在存在合适示例的前提下,以该给定曲线为唯一不变代数曲线的多项式向量场构成的空间是剩余集且具有满测度。我们将该框架应用于Kolmogorov向量场,证明一般情形下坐标轴是其唯一的不变代数曲线。最后,我们还细化了与希尔伯特第十六问题相关的现有刻画,证明若n次向量场的极限环个数存在上界,则该上界可由不存在代数极限环的向量场达到。
英文摘要:
In this work we revisit and extend the method introduced by Lins Neto, Sad and Scárdua for detecting the non-existence of invariant algebraic curves other than some prescribed invariant nodal curve. We prove that, under the existence of a suitable example, the space of polynomial vector fields whose elements have the prescribed curve as their unique invariant algebraic curve is residual and of full measure. We apply this framework to Kolmogorov vector fields, showing that generically the coordinate axes are the unique invariant algebraic curves. Finally, we also refine existing characterizations related to Hilbert's 16th problem, showing that if there exists a bound for the number of limit cycles of a vector field of degree n, then it can be attained by a vector field without algebraic limit cycles.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。