From Mathematics of Reaction Networks
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A chemical reaction network \mathcal{N} = (\mathcal{S},\mathcal{C},\mathcal{R}) endowed with some kinetic scheme is said to exhibit multistability or multistationarity if there exist multiple positive chemical concentration vectors \vec{c}_1, \ldots, \vec{c}_p \in \mathbb{R}_{>0}^m such that \Gamma \vec{R}(t,\vec{c}_i) = 0.

Multistability is an important topic in the application of chemical reaction network theory because it is believed to be the phenomenon underlying many biochemical switches.

Multistationarity in mass action systems