latex 双下标的打法
如下为代码格码\displaystyle\limsup_{\mbox{\tiny$\begin{array}{c}
y\rightarrow x\\[-2pt]
y\in X\setminus S
\end{array}$}} \beta_k(y)
\[\displaystyle\limsup_{\mbox{$\begin{array}{c}{\small y\rightarrow x}\\[-6pt]{\small y\in X\setminus S }\end{array}$}}\beta_k(y)\]
:lol \[{}_D\sigma_X^2\] 将下标放到左下角,就是用{}_s来实现下沉,然后右边正常写文字{}_s\!X效果:${}_s\!X$
static/image/hrline/line2.png
将下标放到左上角,就是用{}^s来实现上升,然后右边正常写文字
{}^t\!X效果:${}^t\!X$
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