@inbook {IOPORT.05374288, author = {Bagnoli, Franco and Rechtman, Ra\'ul}, title = {Entropy and chaos in a lattice gas cellular automata.}, year = {2008}, booktitle = {Cellular automata. 8th international conference on cellular automata for research and industry, ACRI 2008, Yokohama, Japan, September 23--26, 2008. Proceedings}, isbn = {978-3-540-79991-7}, pages = {120-127}, publisher = {Berlin: Springer}, doi = {10.1007/978-3-540-79992-4_16}, abstract = {Summary: We find a simple linear relation between the thermodynamic entropy and the largest Lyapunov exponent (LLE) of a discrete hydrodynamical system, a deterministic, two-dimensional lattice gas automaton (LGCA). This relation can be extended to irreversible processes considering Boltzmann's $H$ function and the expansion factor of the LLE. The definition of LLE for cellular automata is based on the concept of Boolean derivatives and is formally equivalent to that of continuous dynamical systems.}, identifier = {05374288}, }