Test wp-quicklatex plugin

Let’s see if we just choose the first part in $\text{(???)}$, how the entropy looks like, and it’s meanings. Schwarzschild black hole’s surface gravity is
$$\kappa =\frac{1}{4M},$$
and $\beta =\frac{1}{T_H}=\frac{2\pi }{\kappa }=8\pi M$, $r_H=2M$ is the event horizon, then the entropy is
$$S=\frac{2M}{360h}.$$
If we choose the cutoff as
$$h=\frac{T_H}{90}=\frac{1}{720\pi M}=\frac{1}{90\beta },$$
then the entropy becomes
$$S=4\pi M^2=\pi r_H^2=\frac{1}{4}A.$$
where $A=4\pi r_H^2$ is the area of the event horizon. The entropy is the Bekenstein-Hawking entropy.