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A quasi-stationary distribution (qsd) is a probability measure \\nu on \\Lambda that satisfies: starting with \\nu, the conditional distribution at time t, given that at time t the process has not been absorbed, is still \\nu. That is, \\nu(x) = \\nu P_t(x)/(\\sum_{y\\in\\Lambda}\\nu P_t(y)), with P_t the transition probabilities for the process with rates Q.\n  A Fleming-Viot (fv) process is a system of N particles moving in \\Lambda. 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