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 * $$f_W(x,p)\to f_{B.E.}(p\beta u) = \frac{(2\pi)^{-3}}{exp(\beta p\cdot u) - 1}$$
 * $$\beta = \frac{1}{T}$$


 * $$\lim_{x\rightarrow \infty}\frac1x$$


 * $$\lim_{x\rightarrow 0}\frac{\sin x}{x}$$