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Lyapunov function
Suppose we are given an autonomous system of first order differential equations.
Let the origin be an isolated critical point of the above system.
A function that is of class and satisfies is called a Lyapunov function if every open ball contains at least one point where If there happens to exist such that the function , given by
is positive definite in . Then the origin is an unstable critical point of the system.
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new problem: Curve fitting using the Exchange Algorithm. by jeremyboden
new question: Undirected graphs and their Chromatic Number by Serchinnho


