[sdiy] slightly ot: Chua circuit and chaos

[Ian Fritz]

Martin --

HUH? I don't get that one. I have right in front of me a book that shows 
data on a driven pendulum that has all the characteristics predicted by the 
nonlinear dynamic theory. And of course there have been thousands of such 
experiments by now. And the original Lorentz paper, which I have read, was 
based on experimental data.  What exactly do you think you are seeing when 
you look at the output of a Chua circuit?

This needs a better explanation, Martin!

   Ian


At 04:31 AM 2/10/2003, Czech Martin wrote:
>I'm just reading a book a second time, just to make sure I understand.
>The statement of this book is shocking:
>
>there is no real chaos in physics, it is only the models
>that can act chaotic. This topic was covered before,
>even by the "inventor" of numerical chaos, Lorentz.
>
>The tite is: "Der SchmetterlingsDefekt"
>
>or the butterfly Defekt
>
>http://www.amazon.de/exec/obidos/ASIN/3608943226/028-0134132-1666121
>
>It seems to be not translation or summary of other english
>texts (which is quite often the case).
>
>I think the autor (Mr. Wehr) has done a good job
>showing how parasites take up a new fashion of science
>and draw more then speculative statements out of it.
>He also shows what huge methodical questions come up
>if physics takes place in the computer and not
>in the lab any more. Questions like:
>can we trust computer simulations, if different operation systems
>and hardware bring very different results for the same problem?
>Are real numbers a correct model for physicl quantities?