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Universality in complex systems
Among complex, interacting systems built up from: particles, galaxies, animals, cars, money, web nodes ... etc. power-laws, scaling, fractals are common -> Universality classes appear, determined solely by the collective behavior of parts.
Example at critical phase transitions, where the correlation length diverges.
In equilibrium systems these classes are well understood: standard classes; role of symmetries, dimensions, boundary conds. are discovered)
We hope to extend this scenario for nonequilibrium systems and can classify universality classes (see: G.Ódor: Rev. Mod. Phys. 76 (2004) 663.