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[tex]S(A)=\int^{T_A}_0C_V\frac{dT}{T}[/tex]

where [tex]A[/tex] is state of the system in which temperature is [tex]T_A[/tex]. When [tex]T_A\rightarrow 0[/tex] and [tex]C_V[/tex] must go to zero. Why? And how fast does it go?

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# Nernst theorem

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