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Systems can be represented by mathematical models of many different forms, such as algebraic equations, differential or integral equations, finite state machines, Petri nets, rules, etc. They are used particularly in the natural sciences and engineering disciplines such as physics, biology, electrical and computer engineering, in the social sciences such as economics or sociology. Engineers, computer scientists, physicists and economists use mathematical models most extensively. A mathematical model should be a representation of the essential aspects of an existing system (or a system to be constructed). This model should express the knowledge of that system in usable form .