Abstract
Approximate master equations for the Friedrichs model are discussed. The approximate Zwanzig equation predicts behaviour very close to the exact one, but presents only minor simplifications of necessary calculations, while an approximate convolutionless equation usually gives a reasonably good account of the behaviour of exact solutions and simplifies the calculations significantly. It is also shown that the van Hove and Markov limits give incorrect asymptotics in a physically interesting case.
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