Since a population inherently is a distributed system, it usually is complex and difficult to find an exact solution by conventional mathematical methods. To facilitate the solution of population systems, in this paper, the distributed-parameter model is reduced to a lumped-parameter model with distributed time lag, and two methods in frequency domain approach are developed to compute the impulse response of population systems. Since there is no information loss in the computation, the result is considered to be exact. The data and procedure required for the computation are rather simple. A typical example is given.

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