 Stationarity equations (source code)

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= Stationarity equations
{title2=$\pi_j=\sum_i\pi_iP_{ij}$}

For a discrete-time <Markov chain> with <transition matrix> $P$, these equations, together with $\pi_j\geq0$ and $\sum_j\pi_j=1$, say that $\pi$ is a <stationary distribution>. Incoming <probability> mass equals the current mass at each state. They are global balance equations and do not require <detailed balance>.

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