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Mathematical models of COVID-19 spread

The paper presents classification and analysis of the mathematical models of COVID-19 spread in different groups of populations such as the family, school, office (3-100 people), neighborhood (100-5000 people), city, region (0.5-15 million people), country, continent and the world. The classification covers the main types of models including time-series, differential, imitation ones, and their combinations. The time-series models are built from analysis of the time series derived using filtration, regression and network methods (Section 2). The differential models include those derived from systems of ordinary and stochastic differential equations as well as partial-derivative equations (Section 3). The imitation models include cellular automata and agent-based models (Section 4). The fourth group in the classification is combinations of nonlinear Markov chains and optimal control theory, derived within the framework of the mean-field game theory. Due to the novelty of the disease and the difficulties it causes, the parameters of most models are, as a rule, unknown, which necessitates one to solve the inverse problem, so the paper also analyses the main algorithms to solve the inverse problem such as stochastic optimization; nature-like algorithms (genetic; differential evolution; particle swarm, etc.); the understanding method; big-data analysis, and machine learning.

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