In a continuous time Markov chain {X(t)}, define p ij (t) as the probability that X(t + s) = j, given that X(s) = i, for s, t ≥ 0, and r ij as the transition rate out of state i to state j. Then Kolmogorov’s forward equations say that, for all states i,j and times t ≥ 0, dp ij (t)/dt = \( \sum \)k≠jr kj p ik (t) − \( \nu \) j p ij (t), where \( \nu \) k is the transition rate out of state k, \( \nu \) k = \( \sum \) j r kj .
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(2013). Forward Kolmogorov Equations. In: Gass, S.I., Fu, M.C. (eds) Encyclopedia of Operations Research and Management Science. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-1153-7_200240
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