Figure 2From: Wave propagation in a diffusive SEIR epidemic model with nonlocal transmission and a general nonlinear incidence rateThe curves of \(c^{*}(\tau )\). Let \(F(S,I)=\beta S*I\), \(\alpha =1\), \(\beta =3\), \(S_{0}=1\), \(\gamma =1.5\), and \(k=0.5\) be fixed. Additionally, \(d_{2}=4\) and \(d_{3}=7\). We can see that the minimal wave speed \(c^{*}\) of the first, second, and third models decreases as \(\tau \rightarrow \infty \)Back to article page