Folding behavior refers to the characteristic way that a dynamical system can transition between different states, often exhibiting a sudden change in the number of equilibrium points. This behavior is particularly relevant in saddle-node bifurcations, where two equilibrium points collide and annihilate each other as a parameter is varied. The folding behavior captures how these equilibria 'fold' in response to changes in system parameters, leading to qualitative shifts in system dynamics.
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