This paper provides a tutorial review of the use of delay differential equations in
mathematical models of real problems. We use the COVID-19 pandemic as an example to …

In this paper we develop an approach for obtaining the solutions to systems of linear
retarded and neutral delay differential equations. Our analytical approach is based on the …

In this paper, we propose a methodology for computing the analytic solutions of linear
retarded delay-differential equations and neutral delay-differential equations that include …

In this paper, neutral delay differential equations, which contain constant and proportional
terms, termed mixed neutral delay differential equations, are solved numerically. Moreover …

In this paper we develop an approach for obtaining the solutions to systems of linear
retarded and neutral delay differential equations. Our analytical approach is based on the …