数学
不变(物理)
差速器(机械装置)
多项式的
不变多项式
立方函数
纯数学
数学分析
矩阵多项式
物理
数学物理
热力学
出处
期刊:Topological Methods in Nonlinear Analysis
[Uniwersytet Mikolaja Kopernika/Nicolaus Copernicus University]
日期:2020-05-30
卷期号:: 1-1
被引量:2
标识
DOI:10.12775/tmna.2020.004
摘要
Assume that a cubic polynomial differential system in the plane has four invariant straight lines in generic position, i.e., they are not parallel and no more than two straight lines intersect in a point. Then such a differential system only can have $0$, $1$ or $3$ centers.
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