In the case where a differential equation system can not be integrated, the stability problem
presents difficulties. It is therefore of prime importance to find methods for solving the stability
problem independent of integration, and obtain knowledge of critical zero points of a function,
which in turn provids stationary trajectories of an ordinary differential equation system whose
stability can be studied.
Local and global behaviour of critical points of real functions were studied by Morse Theory
[26, 28, 29]. Quadratic terms in the Taylor expansion of the function and their nondegeneracy
play a crucial role in local investigation. Global propositions connect the topological properties
of the domain of the function and the number of nondegenerate local extremum points and
saddle points.
In this article, sufficient conditions are given to provide a lower bound for the number
of stable or unstable stationary trajectories of an autonomous ordinary differential equation
system. In previous articles, a priori conditions were given to prove the existence of zeros
of a function, which provide stationary trajectories [1–16]. As in previous articles, we use
continuation methods [17–21]. We will use the following definitions and theorems [22–29].
In the case where a differential equation system can not be integrated, the stability problempresents difficulties. It is therefore of prime importance to find methods for solving the stabilityproblem independent of integration, and obtain knowledge of critical zero points of a function,which in turn provids stationary trajectories of an ordinary differential equation system whosestability can be studied.Local and global behaviour of critical points of real functions were studied by Morse Theory[26, 28, 29]. Quadratic terms in the Taylor expansion of the function and their nondegeneracyplay a crucial role in local investigation. Global propositions connect the topological propertiesof the domain of the function and the number of nondegenerate local extremum points andsaddle points.In this article, sufficient conditions are given to provide a lower bound for the numberof stable or unstable stationary trajectories of an autonomous ordinary differential equationsystem. In previous articles, a priori conditions were given to prove the existence of zerosof a function, which provide stationary trajectories [1–16]. As in previous articles, we usecontinuation methods [17–21]. We will use the following definitions and theorems [22–29].
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