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


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


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

这篇文献的笔记...

我们有$$d\tau =a e^{a\xi}dT$$,所以$$u=(\cosh(aT),\sinh(aT), a=(e^{-a\xi}\sinh(aT),e^{-a\xi}\cosh(aT))$$,而$$g_{\mu\nu}u^\mu u^\nu=-1, g_{\mu\nu}a^\mu a^\nu=e^{-a\xi}$$.

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本文档除了包括推导, 疑惑 外,做 读书重点 的记录 $$$$