Stability Classification: How to Determine if a System is Asymptotically Stable?

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SUMMARY

The discussion focuses on the classification of equilibrium points in dynamical systems, specifically identifying stable nodes, saddles, and centers. A stable node is confirmed to be asymptotically stable due to its eigenvalues having negative real parts. In contrast, a saddle point is definitively not asymptotically stable, while a center is categorized as a stable equilibrium but not asymptotically stable. The classification relies on the analysis of eigenvalues associated with the system's linearization.

PREREQUISITES
  • Understanding of dynamical systems and equilibrium points
  • Familiarity with eigenvalues and their significance in stability analysis
  • Knowledge of linearization techniques for systems of differential equations
  • Concept of asymptotic stability in the context of system dynamics
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  • Study the concept of eigenvalue analysis in dynamical systems
  • Learn about Lyapunov stability criteria for nonlinear systems
  • Explore the differences between stable and asymptotically stable equilibria
  • Investigate the role of phase portraits in visualizing stability
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Students and professionals in mathematics, engineering, and physics who are studying dynamical systems, particularly those interested in stability analysis and equilibrium classification.

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Homework Statement



How can i classify

(1) stable node
(2) saddle and
(3) center

as either

(a) stable or asymptotically stable?

Homework Equations



<None>

The Attempt at a Solution



All three are stable. Stable node seems to be asymptotically stable. But I am not sure about Saddle and center? I think saddle is not asymptotically stable.
 
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This can be evaluated by considering real part of eigenvalues < 0.

But can you let me visualize it conceptually?
 
Moreover, will a "center" be referred to as a stable or unstable equilibrium?
 

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