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Scarfone, A. Sparavigna, G. Kaniadakis, T. Wada","submitted_at":"2017-05-10T17:50:27Z","abstract_excerpt":"The intriguing and still open question concerning the composition law of $\\kappa$-entropy $S_{\\kappa}(f)=\\frac{1}{2\\kappa}\\sum_i (f_i^{1-\\kappa}-f_i^{1+\\kappa})$ with $0<\\kappa<1$ and $\\sum_i f_i =1$ is here reconsidered and solved. 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