# uforpligtende dating Herlev - Single exponential decay function

## Single exponential decay function

If $b \gt 1$, then the population size doubles after a time of $T_=\frac$.

\end We can make this equation look even nicer by taking the logarithm of both sides.

When it's a rate of decrease, you have an exponential decay function!

Check out these kinds of exponential functions in this tutorial!

The green line shows the population size $P_T = P_0 \cdot b^T.$ You can change the initial population size $P_0$ by dragging the green point and change the base $b$ by typing a value in the box.