Talk:Cheeger bound

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Hope someone comes along and improves this. I've seen this bound for the finite Markov chain case...anyone know if it is true if, say, the state space is countable? --Pierremenard 03:35, 9 February 2006 (UTC)[reply]

on Riemannian manifolds

It's my understanding that this idea comes from global analysis, where we derive a constant for a Riemannian closed manifold by minimizing the quotient ${\frac {|\partial A|}{|A|}}$ ranging $A$ over all submanifolds. Please if someone knows more about this, by another name perhaps, let me know and/or add to this. MotherFunctor 20:50, 28 August 2006 (UTC)[reply]