The Boltzmann/Shannon entropy as a measure of correlation

Details The Boltzmann/Shannon entropy as a measure of correlation The Boltzmann/Shannon entropy as a measure of correlation

2000-01-17

arxiv.org/abs/math-ph/0001024v1

Physics

Mathematical Physics

Scientific paper

IIt is demonstrated that the entropy of statistical mechanics and of information theory, $S({\bf p}) = -\sum p_i \log p_i $ may be viewed as a measure of correlation. Given a probability distribution on two discrete variables, $p_{ij}$, we define the correlation-destroying transformation $C: p_{ij} \to \pi_{ij}$, which creates a new distribution on those same variables in which no correlation exists between the variables, i.e. $\pi_{ij} = P_i Q_j$. It is then shown that the entropy obeys the relation $S({\bf p}) \leq S({\bf \pi}) = S({\bf P}) + S({\bf Q})$, i.e. the entropy is non-decreasing under these correlation-destroying transformations.

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