![]() SEIR Model obtained Ordinary Differential Equation (ODE) non-linear System 4-D which then reduces to 3-D. Several factors affect the population in this model is vaccination, immigration and emigration that occurred in the population. Population devided by four variables, namely: Susceptible, Exposed, Infected and Recovered ( SEIR). Mathematical modelling and simulation for Hepatitis B discuss in this paper. Side, Syafruddin Irwan, Mulbar, Usman Sanusi, Wahidah 12, pealk.: President Ilves presents commemorative stone for the restoration of independence to artist Heinz Valk ![]() augustil 2007 Kadriorus kultuuritegelastele korraldatud vastuvõtul Eesti iseseisvuse taastamise mälestuskivi kunstnik Heinz Valgule. Heinz Valk sai iseseisvuse taastamise mälestuskivi augustit tuleks nimetada just iseseisvuse taastamise aastapäevaks ja mitte taasiseseisvumise päevaks President Ilves andis iseseisvuse taastamise mälestuskivi kunstnik Heinz Valgule / Kristel Peterson
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