分析了平衡状态稳定性的充分条件。
Sufficiant condition for stability of equilibrium states is introduced.
利用向量比较原理，得到了确定非线性电路平衡点全局渐近稳定的充分必要条件。
The sufficient and necessary conditions for the global asymptotic stability of the equilibrium point of the nonlinear circuits are obtained by vector comparison method.
用相平面法分析螺旋线平衡的稳定性，导出解析形式的稳定性条件。
The stability of the helical equilibrium is analyzed with phase plane method, and an analytical criterion of stability is revealed.
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