Markdown数学公式

1.常用符号、公式及排版

https://blog.csdn.net/u013914471/article/details/82973812

2.Arg min（max）公式

https://blog.csdn.net/chengyq116/article/details/102540774

$$
{\underset {x\in S\subseteq X}{\operatorname {arg\,max} }}\,f(x):=\{x\mid x\in S\wedge \forall y\in S:f(y)\leq f(x)\}.
$$

$$\underset{x\in S\subseteq X}{\mathrm{argmax}}f(x):=\{x\mid x\in S\wedge \forall y\in S:f(y)\le f(x)\}.$$