Figure 8

Comparison of solutions obtained by NSFD and RK4 numerical schemes for \(F_{0}\) with an initial condition \((S(0), E(0), I(0), R(0))=(0.1, 0.1, 0.1, 0.1)\) and step size \(h=2.5\) with \(\mathcal{R}_{0}=0.2167<1\). Again, RK4 fails to converge but NSFD converges to the true steady state of \(F_{0}\)