A remark on the concavity of entropy

Foundations of Physics 9 (11-12):939-946 (1979)
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Abstract

We investigate to what extent theorems about quantum mechanical or classical entropy can be generalized to functionals of the type ρ→Tr f(ρ), or ψ→∫f(ψ)dμ, respectively, wheref is an arbitrary concave function

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10.1007/bf00708702

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