A multifractal walk down wall street pdf9/22/2023 Then this number fell to preceding values during a day. On this day, the daily incidence increased by 2.4 times as compared to the preceding time. For example, on Decema substantial jump of COVID-19 daily incidence in the world had been observed. The description of v( t) evolution is greatly complicated by the presence of jumps. Therefore, the applicability of differential and integro-differential equations to the pandemics description becomes problematic. From this fact it follows that the curve v( t) is not differentiable. As shown by calculations of the fractal dimensions D for various segments of v( t) during the time interval of interest for us, the values of D lie within an interval from 1.0708 to 1.4118. The function v( t) constructed basing on the world statistical data for COVID-19 pandemic determines a complex multifractal curve. In many papers, the function v( t) is determined by solving differential and integro-differential equations. This function is determined using relevant statistical data. The quantitative description of pandemics is based on the function v(t), which determines the time dependence of the number of daily diseases in the world associated with specific pandemics. The relevance of constructing and applying such models has been greatly enhanced by the COVID-19 pandemic. At present, one of the most demanded issues of mathematical modeling is developing adequate mathematical models of pandemics.
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