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Re: cusp fold surface


dwarnold45 at cox.net wrote:
> All,
>
> Has anyone done a bifurcation analysis of dx/dt=h+rx-x^3, where h and r
> are parameters?
>
> I am looking for some mathematica code that will darw cusp catastrophe
> surface above bifurcation curves in the (r,h) plane.
>
> Thanks.

Hint: Let t = s so that we have unit tangent velocity along the curve.
Slope of curve is  phi, dx/ds = cos(ph) , dy/ds = sin(ph). The roots of
RHS are the turning points at cusp.


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