Bifurcation values for logistic map

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Discussion Overview

The discussion revolves around finding the bifurcation values for the logistic map, specifically focusing on the numerical determination of the parameter r at which bifurcations occur. The conversation includes attempts to solve a homework problem related to the logistic equation and the conditions for bifurcation.

Discussion Character

  • Homework-related
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant attempts to find bifurcation values by setting the logistic function to zero and derives r values of 0 and 1, expressing confusion about the correctness of this approach.
  • Another participant questions the reasoning behind setting the function to zero, asking what is special about the value of zero in this context.
  • A different participant suggests that to find bifurcation values, one must set dx/dt = 0, indicating a different approach to identifying bifurcation points.
  • There is a challenge regarding the notation used, with one participant asserting that the equation dx/dt = 0 is distinct from the original logistic equation.
  • Further clarification is sought on the meaning of f(x) in relation to dx/dt, with some participants expressing confusion about the implications of setting f(x) to zero.
  • Participants express uncertainty about how the initial participant derived the specific r values mentioned.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct method for determining bifurcation values, with multiple competing views and approaches presented throughout the discussion.

Contextual Notes

There are unresolved questions regarding the notation and the mathematical steps involved in finding bifurcation values, as well as differing interpretations of the conditions necessary for bifurcation in the logistic map.

sumonmumu
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Homework Statement



Find numerically the r values for the first 2 bifurcations.

Homework Equations



xi+1 = f(xi), f(x) = rx(1 − x)

The Attempt at a Solution



To find the values of r, first I set rx(1−x)=0 to find x and then used the x values to find r=0 and r=1. But, I am still confused. Do you think what I did here is correct? If not, can you help me find the mistakes here?
 
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first I set rx(1−x)=0 to find x
Why =0? What is special about 0?
 
To find the bifurcation value, you have to set dx/dt = 0. That's the speciality.
 
dx/dt = 0 is different from your equation.
 
f(x) = dx/dt here.
 
Okay, then I don't understand your notation, but f(x)=0 is nothing special just because there is a zero.

and then used the x values to find r=0 and r=1
And I don't understand how you got that.
 

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