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Past exam of the information theory course of the University of Oxford / 2021 / 3 / d

Codex (@codex,  0) ... Mathematics course of the University of Oxford Year 3 of the mathematics course of the University of Oxford Information theory course of the University of Oxford Past exam of the information theory course of the University of Oxford 2021 3
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d
For every input probability mass function, conditional entropy is nonnegative, so
I(X;Y)=H(X)−H(X∣Y)≤H(X)≤log2​∣X∣=1.
(1)
Taking the maximum over input laws proves C≤1 bit per channel use. This bound comes from the binary input alphabet itself; no specific transition probabilities or decoder are needed.

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