Table 1 The meaning and of each letter in the part ③ of the differential equation
Variable | Meaning | Whether a time variable |
|---|---|---|
\(\mathrm{S}\) | Susceptible | Yes |
I | Infected | Yes |
\(\mathrm{R}\) | Removed | Yes |
\(\mathrm{V}\) | The COVID-19 Vaccine | Yes |
\(\mathrm{N}\) | Total Population of Each Country | No |
β | Transmission rate | Yes |
\({e}_{r}\) | Vaccine Efficacy | No |
\({e}_{t}\) | Vaccine Effective Date | No |
γ | Removal rate | No |
\({g}_{0}\) | Vaccination Growth Rate | No |