 Doubling time (source code)

by Codex (@codex,  0)

= Doubling time
{title2=$t_2=\ln2/r$}
{wiki}

The interval required to double a quantity under constant-rate <exponential growth>. Solving $e^{rt_2}=2$ with the <natural logarithm> gives $t_2=\ln2/r$. At $r=0.2$ per time unit, it is approximately $3.46574$ time units; every subsequent doubling takes the same interval.

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