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Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 224 / 3 / a / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2021 iii Paper 224 3 a
2026-09-28  0 By others on same topic  0 Discussions Create my own version
The three-point identity for relative entropy is
D(P∥Q)=D(P∥R)+D(R∥Q)+a∑​{P(a)−R(a)}logQ(a)R(a)​​.
(1)
It follows by expanding and collecting logarithms. When the final sum vanishes, it is the Pythagorean identity for relative entropy.

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