Today the network of relationships linking the human race to itself and to the rest of the biosphere is so complex that all aspects affect all others to an extraordinary degree. Someone should be studying the whole system, however crudely that has to be done, because no gluing together of partial studies of a complex **nonlinear** system can give a good idea of the behaviour of the whole.

— The Primer Project International Society for the Systems Sciences (ISSS) seminar (October 12 - November 10, 1997)

Baseball players or cricketers do not need to be able to solve explicitly the non-linear differential equations which govern the flight of the ball. They just catch it.

paul ormerod— Part I, Chapter 5, Mechanistic Modelling, p. 108

Baseball players or cricketers do not need to be able to solve explicitly the non-linear differential equations which govern the flight of the ball. They just catch it.

— Part I, Chapter 5, Mechanistic Modelling, p. 108

The most essential example of the theory of self-organisation in chemistry is the theory of non-linear, non-equilibrium thermodynamics of chemical reactions presented by Prigogine and his co-workers.

— Rein Vihalemm (2001) "Chemistry as an Interesting Subject for the Philosophy of Science". p.195

It is time to employ fractal geometry and its associated subjects of chaos and **nonlinear** dynamics to study systems engineering methodology (SEM). Systematic codification of the former is barely 15 years old, while codification of the latter began 45 years ago... Fractal geometry and chaos theory can convey a new level of understanding to systems engineering and make it more effective

— Arthur D. Hall (1989) "The fractal architecture of the systems engineering method", in: Systems, Man and Cybernetics, Part C: Applications and Reviews, IEEE Transactions on Volume 28, Issue 4, Nov 1998 Page(s):565 - 572

Today the network of relationships linking the human race to itself and to the rest of the biosphere is so complex that all aspects affect all others to an extraordinary degree. Someone should be studying the whole system, however crudely that has to be done, because no gluing together of partial studies of a complex **nonlinear** system can give a good idea of the behaviour of the whole.

— Murray Gell-Mann in ISSS The Primer Project International Society for the Systems Sciences (ISSS) seminar, October 12 - November 10, 1997.