常用数学符号的 LaTeX 表示方法

公告

My notes:

空格间隙设置表：

两个quad空格	a \qquad b	$a \qquad b$	两个m的宽度
quad空格	a \quad b	$a \quad b$	一个m的宽度
大空格	a\ b	$a\ b$	1/3m宽度
中等空格	a;b	$a\;b$	2/7m宽度
小空格	a,b	$a\,b$	1/6m宽度
没有空格	ab	$ab\,$
紧贴	a!b	$a\!b$	缩进1/6m宽度

正下方的下标
$\min \limits_{a,b} a x^2 + 2b$ : $\min \limits_{a,b} a x^2 + 2b$

Mathematical Fonts

Let $ \mathcal{T} $ be a topological space, a basis is defined as
 \mathcal{B} = \{B_{\alpha} \in \mathcal{T}\, |\,  U = \bigcup B_{\alpha} \forall U \in \mathcal{T} \}

Let $ \mathcal{T} $ be a topological space, a basis is defined as
$ \mathcal{B} = {B_{\alpha} \in \mathcal{T}, |, U = \bigcup B_{\alpha} \forall U \in \mathcal{T} } $

Several fonts require the addition of the line \usepackage{amssymb} to the preamble to work. Open overleaf example

Capital letters-only font typefaces

There are some font typefaces that support only a limited number of characters; these fonts usually denote some special sets.

\begin{align*}
RQSZ \\
\mathcal{RQSZ} \\
\mathfrak{RQSZ} \\
\mathbb{RQSZ}
\end{align*}

This example shows Calligraphic, Fraktur and Blackboard bold typefaces. For instance, to display the R in blackboard bold typeface $\mathbb{R}$ will do the trick.

Other mathematical fonts

It's possible to set a different font family for a complete mathematical expression.

\begin{align*}
3x^2 \in R \subset Q \\
\mathnormal{3x^2 \in R \subset Q} \\
\mathrm{3x^2 \in R \subset Q} \\
\mathit{3x^2 \in R \subset Q} \\
\mathbf{3x^2 \in R \subset Q} \\
\mathsf{3x^2 \in R \subset Q} \\
\mathtt{3x^2 \in R \subset Q} 
\end{align*}