Not a Problem
The attached GeoGebra file implements the inversion of a páck of circles using a rectangle with circles and a straight line. But it has several instabilities in its operation. Please, see the animation here:
http://www.im-uff.mat.br/tm...
If I ask to GeoGebra animate the point P after the construction is loaded, P walks over all elements of the list. But, if I change the value of n, the animation of P occurs only on the top circles.
Files:
inversão...
The same problem 
Locus isn't the right tool for this job - it's optimised for simple geometric objects
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