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Advances in Mathematical Physics
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Advances in Mathematical Physics
/
2022
/
Article
/
Tab 1
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Research Article
Dynamic Analysis of a VSEIR Model with Vaccination Efficacy and Immune Decline
Table 1
Equation (
4
). The sign change of factors
and
and the number of possible equilibrium points of endemic diseases.
Cases
Compare
and
Coefficients
No. of possible positive roots
+
+
1
−
+
1
−
−
0
+
+
1
−
−
0
+
+
1
+
−
2
−
−
0