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An important extensive property of all systems in thermodynamics, statistical mechanics, and information theory, quantifying their disorder (randomness), i.e., our lack of information about them. It characterizes the degree to which the energy of the system is *not* available to do useful work.

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Dependence of $c$-function and justification of entropic $c$-theorem

I am reading the paper on the $c$-theorem [1:Zamolodchikov 1986] and the entropic $c$-theorem [2:Casini, Huerta 2006]. Q1. What do you mean by "monotonically decreasing under RG flow"? I am unclear o …
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