For https://github.com/scutan90/DeepLearning-500-questions/blob/master/ch07_%E7%94%9F%E6%88%90%E5%AF%B9%E6%8A%97%E7%BD%91%E7%BB%9C(GAN)/%E7%AC%AC%E4
%B8%83%E7%AB%A0_%E7%94%9F%E6%88%90%E5%AF%B9%E6%8A%97%E7%BD%91%E7%BB%9C(GAN).md, the formula doesn't show well. I asked Zhengxia, he says that markdown doesn't support formula very well. As he knows markdown doesn't support the in-line formula. He uses markdown, but he doesn't use formula in it. If you have to use formula, you can use latex. If we use Typora, at the lower left corner, select "启用源代码模式". Change 
$$\mathop {\min }\limits_G \mathop {\max }\limits_D V(D,G) = {{\rm E}{x\sim{p{data}}(x)}}[\log D(x)] + {{\rm E}_{z\sim{p_z}(z)}}[\log (1 - D(G(z)))]$$
to make both $$ in a separate line. Select "退出源代码模式" and press F5 which means 刷新. The formula will show correctly.
Google search "online markdown". For example, if we use https://dillinger.io/, copy the code from Typora to https://dillinger.io/. We will find that if we want to see the formula, we have to use in this way: $$\mathop {\min }\limits_G \mathop {\max }\limits_D V(D,G) = {{\rm E}{x\sim{p{data}}(x)}}[\log D(x)] + {{\rm E}_{z\sim{p_z}(z)}}[\log (1 - D(G(z)))]$$