General pseudoadditivity of composable entropy prescribed by the existence of equilibrium.
The concept of composability states that entropy of the total system composed of independent subsystems is a function of entropies of the subsystems. Here, the most general pseudoadditivity rule for composable entropy is derived based only on the existence of equilibrium.
Abe
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College of Science and Technology, Nihon University, Funabashi, Chiba 274-8501, Japan.