A system which responds to an increase or decrease of some input by a change of the same amount in its corresponding variable.
Only very simple systems, in fact simple functions, if they may be called systems, can be linear. The real condition of linearity is that the system be very poorly joined in ASHBY's sense, i.e. devoid of significant internal interactions, constraints and feedbacks. No complex system can be linear more than in a very limited, local and provisional sense.
R. VALLÉE provides a good global overview of dynamic linear systems of differencial nature (continuous) or recurrent (discrete time) (1992, p.114-26).
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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