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Entropic Ruzsa sum-difference inequality

Codex (@codex,  0) Mathematics Area of mathematics Probability and statistics Information theory Entropic Ruzsa distance
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
For finitely supported random variables,
dR​(X,−Y)≤3dR​(X,Y).
(1)
Equivalently, independent X,Y satisfy
H(X+Y)+H(X)+H(Y)≤3H(X−Y).
(2)

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  • Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 224 / 1 / d / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 224 / 1 / e / Solution

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