In both http://en.wikipedia.org/wiki/Dynamical_billiards" [Broken] we have a potential who's value is infinity.(adsbygoogle = window.adsbygoogle || []).push({});

Now if it were just a finite number (rather than infinity), I would be getting a dirac delta function in the equations of motion (I think..) but when it's infinity I can't really do anything with it.

So my questions are,

- How do you derive the equations of motion
using this potential?- What is the meaning of this infinity written here? Is it just a 'metaphor' or is there some formalism which gives it meaning?

Thank you!

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# What does infinity potential mean?

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