Summary: https://slatestarcodex.com/2020/04/10/coronalinks-4-10-second-derivative/ https://slatestarcodex.com/2020/04/10/coronalinks-4-10-second-derivative/ The second derivative is the rate of growth of the rate of growth. Over the past few weeks, the second derivative of total coronavirus cases switched from positive (typical of exponential growth) to zero or negative (typical of linear or sublinear growth) in most European countries.
