Population dynamics is the type of mathematics used to model and study the size and age composition of populations as dynamical systems.
Operophtera brumata populations are geometric.
A logistic function or logistic curve is a common S-shaped curve with the equation
Generalized logistic function (Richards growth curve) in epidemiological modeling
Extrapolated infection trajectories of 40 countries severely affected by COVID-19 and grand (population) average through May 14th