A straight forward computation shows that models (1) &
(2) are continuous and Lipschizian in ℝ_
` . From the existence
and uniqueness of solution of the ordinary differential
equation as contained in above theorems (4.1.1 – 4.1.3), the
solution of both models with positive initial conditions exists
and are unique. Here, we can see for the first differential
equation in both models, that it has a solution, which is also
unique, i.e S = −αSI + γR with positive initial conditions.
In this case, both the function Ft, S! = −αSI + γR and
its partial derivative
?
?e Ft, S! = −αI are defined and
continuous at all points (t, S). The theorem guarantees that a
solution to the ODE exists in some open interval centered at
t3 and that this solution is unique in some (possibly smaller)
interval centered at t3 .
NB: This is also true for the remaining equations in both
models.
A straight forward computation shows that models (1) &(2) are continuous and Lipschizian in ℝ_` . From the existenceand uniqueness of solution of the ordinary differentialequation as contained in above theorems (4.1.1 – 4.1.3), thesolution of both models with positive initial conditions existsand are unique. Here, we can see for the first differentialequation in both models, that it has a solution, which is alsounique, i.e S = −αSI + γR with positive initial conditions.In this case, both the function Ft, S! = −αSI + γR andits partial derivative??e Ft, S! = −αI are defined andcontinuous at all points (t, S). The theorem guarantees that asolution to the ODE exists in some open interval centered att3 and that this solution is unique in some (possibly smaller)interval centered at t3 .NB: This is also true for the remaining equations in bothmodels.
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