Istituto di Biofisica     
Yang J., Grigolini P. On the time evolution of the entropic index. In: Physics Letters A, vol. 263 (4-6) pp. 323 - 330. Elsevier, 1999.
We adapt the Kolmogorov-Sinai entropy to the non-extensive perspective recently advocated by Tsallis. The resulting expression is an average on the invariant distribution, which should be used to detect the genuine entropic index Q. We argue that the condition Q>1 is time dependent.
DOI: 10.1016/S0375-9601(99)00754-9
Subject 05.20.-y

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