= Lerche–Newberger sum rule
{wiki=Lerche–Newberger_sum_rule}
The Lerche–Newberger sum rule is a principle in the field of statistical mechanics and thermodynamics, related to the behavior of systems in equilibrium. Specifically, it provides a relationship between correlation functions and the equilibrium properties of a system, particularly in contexts where random variables influence outcomes. The rule states that the sum of certain statistical correlators (usually related to physical observables) over all possible states of a system leads to significant simplifications.
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