Stochastic Periodic Solution of a Susceptible-Infective Epidemic Model in a Polluted Environment under Environmental Fluctuation

Figure 2

(a), (c) The sample trajectory of and of model (7) (blue lines) and their corresponding deterministic periodic solution (red lines), respectively. (b), (d) the probability density functions (PDFs) of and of model (7) in different periods, respectively. The initial value is and the parameter values are used as in Example 16.

(a)

(b)

(c)

(d)