Einstein function

In mathematics, Einstein function is a name occasionally used for one of the functions


 * $$\frac{x^2e^x}{(e^x-1)^2}$$


 * $$\frac{x}{e^x-1}$$


 * $$\log(1-e^{-x})$$


 * $$\frac{x}{e^x-1}- \log(1-e^{-x})$$