Isaia, Vincenzo M.2022-04-042022-04-042017-03-08Isaia, V. M. (2017). Nonlinear differential equations with deviating arguments and approximations via a Parker-Sochacki approach. <i>Electronic Journal of Differential Equations, 2017</i>(68), pp. 1-25.1072-6691https://hdl.handle.net/10877/15595The Parker-Sochacki method has been successful in generating approximations for a wide variety of ODEs, and even PDEs of evolution type, by achieving an autonomous polynomial vector field and implementing the Picard iteration. The intent of this article is to extend PSM to a large family of differential equations with deviating arguments. Results will be given for problems with delays which are linear in time and state independent, and also have constant initial data and nonlinear differential equations which are retarded, neutral or advanced. The goal of the proofs is to motivate a numerically efficient DDE solver. In addition, an explicit a priori error estimate that does not require derivatives of the vector field is presented. The non-constant initial data cases and the state dependent delay cases are discussed formally.Text25 pages1 file (.pdf)enAttribution 4.0 InternationalDelay differential equationsLagPSM methodMethod of stepsMethod of successive approximationDeviating argumentArticleThis work is licensed under a Creative Commons Attribution 4.0 International License.