:<math>H(x) > 0 \quad \forall x \in \mathcal{B} \setminus\{0\}</math>
:<math>H(x) > 0 \quad \forall x \in \mathcal{B} \setminus\{0\}</math>
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== 自治系统的基本李雅普诺夫定理 Basic Lyapunov theorems for autonomous systems ==
== 自治系统的基本李雅普诺夫定理 Basic Lyapunov theorems for autonomous systems ==
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{{main article|Lyapunov stability}}
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令<math>x^* = 0</math>是如下自治系统的平衡点
令<math>x^* = 0</math>是如下自治系统的平衡点
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:<math>\dot x = -x.</math>
:<math>\dot x = -x.</math>
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Considering that <math>x^2</math> is always positive around the origin it is a natural candidate to be a Lyapunov function to help us study <math>x</math>.
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Considering that <math>x^2</math> is always positive around the origin it is a natural candidate to be a Lyapunov function to help us study <math>x</math>.