latex常用符号及模板

\le
\ge
\in
\mathbb{M}
a \qquad b
\ne
\forall
\exists
\left \lfloor  \right \rfloor
\nmid
\varnothing

\[\begin{aligned}

\le \\ \ge \\
\in \\
\mathbb{M} \\
a \qquad b \\
\ne \\
\forall \\
\exists \\
\left \lfloor \right \rfloor \\
\nmid \\
\varnothing \\
\end{aligned}
\]

左对齐计算模板

$$
\begin{aligned}
& \\
& = \\
& = \\
\end{aligned}

\begin{aligned}
& \qquad\text{get}(l_1,r_1,x)\times \text{get}(l_2,r_2,x)\\
& = (g(r_1,x)-g(l_1-1,x))\times (g(r_2,x)-g(l_2-1,x))\\
& = g(r1,x)\times g(r_2,x)-g(r_1,x)\times g(l_2-1,x)-g(l_1-1,x)\times g(r_2,x)+g(l_1-1,x)\times g(l_2-1,x)
\end{aligned}
$$

\[\begin{aligned}
& \qquad\text{get}(l_1,r_1,x)\times \text{get}(l_2,r_2,x)\\
& = (g(r_1,x)-g(l_1-1,x))\times (g(r_2,x)-g(l_2-1,x))\\
& = g(r1,x)\times g(r_2,x)-g(r_1,x)\times g(l_2-1,x)-g(l_1-1,x)\times g(r_2,x)+g(l_1-1,x)\times g(l_2-1,x)
\end{aligned}
\]