Can a Dynamical System Have Multiple Locally Stable Equilibria?

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Discussion Overview

The discussion revolves around the possibility of a dynamical system having multiple locally stable equilibria. Participants explore the conditions under which this can occur, particularly focusing on the implications of having a finite number of isolated equilibria with stability defined by the eigenvalues of the Jacobian.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions whether it is possible for a dynamical system to have more than one locally stable equilibrium given the initial conditions stated.
  • Another participant interprets the question as asking if the finite number of equilibria can exceed one, suggesting that it can.
  • A specific example of a pitchfork bifurcation system is provided, indicating that it has two stable equilibria for certain parameter values, though this example is later challenged.
  • A participant clarifies that the example given does not meet the requirement since one of the equilibria is unstable, emphasizing the need for all equilibria to be stable.
  • There is an acknowledgment of misunderstanding regarding the stability condition of all equilibria in the initial question.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the examples provided or the interpretation of the question. There are competing views on the conditions under which multiple locally stable equilibria can exist.

Contextual Notes

Some assumptions about the nature of equilibria and their stability are not fully explored, and the discussion reflects varying interpretations of the initial question regarding the number of equilibria.

Ali 2
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Hi all
Suppose for a dynamical system [itex]\dot x=f(x) , x \in \mathbb R^n[/itex] there exists finite number of isolated equilibria, each of which is locally stable (i.e eigenvalues of the associated Jacobian have negative real parts).
My question is: Can this happen for more than one equilibrium? (sorry if it is a trivial question


Regards
 
Last edited:
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what do you mean can it happen for more than 1 equilibrium point? didn't you just hypothesize a finite number of equilibrium points such that blah blah blah? or do you mean if the finite number in the statement can exceed 1. If so, then the answer is yes
 
example, pitchfork bifurcation system: x' = rx - x^3 has 2 stable equilibria for r > 0
 
hi
yes, my question means: can the number of equilibria in the statement exceed one?
The example you provided don't satisfy the requirement. The equilibrium 0 is unstable
thanks.
 
Oh, sorry I read it wrong. I did not see it saying ALL equilbira are stable
 

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