Question: [25] Prove Lemma 5.2.1 on page 359 for the cases in which B is a discrete, possibly nonbinary, alphabet. Comment. Source: [T.M. Cover and J.A.

[25] Prove Lemma 5.2.1 on page 359 for the cases in which B is a discrete, possibly nonbinary, alphabet.

Comment. Source: [T.M. Cover and J.A. Thomas, Elements of Information Theory, Wiley, 1991, pp. 300–301, attributed to I. Csisz´ar, Studia Sci. Math. Hungar., 2(1967), 299–318, and others].

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