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Averaging in the case of multiple invariant measures for the fast system
Mark Freidlin, Leonid Koralov · 2020-02-24 · via math.PR updates on arXiv.org

We consider the averaging principle for deterministic or stochastic systems with a fast stochastic component (family of continuous-time Markov chains depending on the state of the system as a parameter). We show that, due to bifurcations in the simplex of invariant probability measures of the chains, the limiting system should be considered on a graph or on an open book with certain gluing conditions in the vertices of the graph (or on the bifurcation surface).

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