Stability analysis of a mathematical model of hepatitis b virus with unbounded memory control on the immune system in the neighborhood of the equilibrium free point

In the current paper, I research the influence of IL-2 therapy and I introduce the regulation by distributed feedback control with unbounded memory. The results of the stability analysis are presented. The proposed methodology in the article uses the properties of Cauchy matrix C(t, s), especially symmetry property, in order to study the behavior (stability) of the corresponding system of integro-differential equations.