Stability analysis and approximate solution of interval mathematical model for the COVID-19 pandemic

ABSTRACT

In this paper, an interval solution has been constructed for the system of differential equations (SDEs) governing the COVID-19 pandemic with uncertain parameters, namely, interval. The imposition of lockdown on infective has been considered as an interval parameter. As a result, the complete system of first-order differential equations is transformed into interval form. The resulting interval system of differential equations (ISDEs) has been solved with help of the parametric concept and the Runge–Kutta method of order 4. Obtained results are compared with existing crisp results, and they are found to be in good agreement. © 2023 John Wiley & Sons, Ltd.