User:Catbar/playpen


 * $$P(t) = \frac{a}{1 + n e^{-t/\tau}} \!$$

 :$$P(t) = \frac{a}{1 + n e^{-t/\tau}} \!$$ 

$$P(t) = a * \left (1 - exp \left (-\left (\frac{t + c(ln2)^{1/d}-b}{c}\right )^d\right )\right ) \!$$  $$P(t) = a * \left (1 - exp \left (-\left (\frac{x+c(ln2)^{1/d}-b}{c}\right )^d\right )\right ) \!$$