HackerExponential growth and epidemics
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若每天的新增量与已有数量成正比，模型会产生指数增长。再把剩余易感人群的比例放进接触机制，早期看似相同的增长后来可以弯折。
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Exponential growth means that as you go from one day to the next, it involves multiplying by some constant.For a random shuffling model like this, that could mean including a factor like 1 minus the proportion of people in the world who are already infected.