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Scribe Note 2( 22-Jan )

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Saved by Harry
on February 6, 2009 at 11:42:51 am

1. Fano's inequality

Intuition:  If Y is a function of X, Y = g(X), then  H(Y|X) =0 . If we can only estimate Y from X  with some probability of  error P(e), we can image that H(Y|X) will be small if P(e) is small ,and   H(Y|X)->0 , as P(e) -> 0.

Proof:  we model the process as a Markov Chain

                X------> Y--------> \hat{X} 


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