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不连续平面分段线性系统的两点和四点极限环
李争康()
Two-Point and Four-Point Limit Cycles in Discontinuous Planar Piecewise Linear Systems
Li Zhengkang()

图10. 抛物线 $\mathcal{M}_{1}$$\mathcal{M}_{2}$ 的一个有效交点, 绿色抛物线为 $\mathcal{M}_{1}$, 橙色抛物线为 $\mathcal{M}_{2}$.

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