Abstract
Asymptotic methods for singularly perturbed delay differential equations are in many ways more challenging to implement than for ordinary differential equations. In this paper, four examples of delayed systems which occur in practical models are considered :the delayed recruitment equation, relaxation oscillations in stem cell control, the delayed logistic equation, and density wave oscillations in boilers, the last of these being a problem of concern in engineering two-phase flows. The ways in which asymptotic methods can be used vary from the straightforward to the perverse, and illustrate the general technical difficulties that delay equations provide for the central technique of the applied mathematician
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Fowler, A.C. Asymptotic methods for delay equations. J Eng Math 53, 271–290 (2005). https://doi.org/10.1007/s10665-005-9016-z
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DOI: https://doi.org/10.1007/s10665-005-9016-z