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COMPLEX SYSTEM look up translate image
"A complex system is one whose evolution is very sensitive to initial conditions or to small perturbations, one in which the number of independent interacting components is large, or one in which there are multiple pathways by which the system can evolve" (Whitesides & Ismagilov).

"Complex systems are systems in process that constantly evolve and unfold over time" (W. Brian Arthur).

Both definitions are found in Science Vol. 284. No. 5411 (1999) , a special edition on complex systems.