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The term non-linear or nonlinear has several definitions but is generally used to describe a system that cannot be approximated by a superposition principle or perturbative approach.

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How does non-linear behaviour arise from the inherently linear QM framework?

I'd rather answer your question with my question. Classical electrodynamics with Maxwell equations is a linear theory. Yet, there are plenty effects there where we see non-linearity. Non-linearity com …
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