and if we keep only the linear term, we need to understand the dynamics of dn dt

Note that in order to reach Eq. (4.27) we have assumed that both n(t) and n(t — r) are small. This could be a big assumption , but our goal in this analysis is - to some extent - to determine when it fails, which occurs when the deviation n(t) grows in time. As before, we start with the guess n(t) = ceAi and substitute this into Eq. (4.27).

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