$MathJax$常用符号。
$$Hello ; MathJax$$
希腊字母
| 大写       | Tex      | 小写       | Tex      || 大写       | Tex      | 小写       | Tex      |
| :—       | :—     | :—       | :—     || :—       | :—     | :—       | :—     |
| $A$        | A        | $\alpha$   | \alpha   || $N$        | N        | $\nu$      | \nu      |
| $B$        | B        | $\beta$    | \beta    || $\Xi$      | \Xi      | $\xi$      | \xi      |
| $\Gamma$   | \Gamma   | $\gamma$   | \gamma   || $O$        | O        | $\omicron$ | \omicron |
| $\Delta$   | \Delta   | $\delta$   | \delta   || $\Pi$      | \Pi      | $\pi$      | \pi      |
| $E$        | E        | $\epsilon$ | \epsilon || $P$        | P        | $\rho$     | \rho     |
| $Z$        | Z        | $\zeta$    | \zeta    || $\Sigma$   | \Sigma   | $\sigma$   | \sigma   |
| $H$        | H        | $\eta$     | \eta     || $T$        | T        | $\tau$     | \tau     |
| $\Theta$   | \Theta   | $\theta$   | \theta   || $\Upsilon$ | \Upsilon | $\upsilon$ | \upsilon |
| $I$        | I        | $\iota$    | \iota    || $\Phi$     | \Phi     | $\phi$     | \phi     |
| $K$        | K        | $\kappa$   | \kappa   || $X$        | X        | $\chi$     | \chi     |
| $\Lambda$  | \Lambda  | $\lambda$  | \lambda  || $\Psi$     | \Psi     | $\psi$     | \psi     |
| $M$        | M        | $\mu$      | \mu      || $\Omega$   | \Omega   | $\omega$   | \omega   |
- 变体形式:
| 大写 | Tex | 小写 | Tex | 
|---|---|---|---|
| $\varGamma$ | \Gamma | ||
| $\varDelta$ | \Delta | ||
| $\varepsilon$ | \varepsilon | ||
| $\varTheta$ | \Theta | $\vartheta$ | \vartheta | 
| $\varkappa$ | \varkappa | ||
| $\varLambda$ | \Lambda | ||
| $\varXi$ | \Xi | ||
| $\varPi$ | \Pi | $\varpi$ | \varpi | 
| $\varrho$ | \varrho | ||
| $\varSigma$ | \Sigma | $\varsigma$ | \varsigma | 
| $\varUpsilon$ | \Upsilon | ||
| $\varPhi$ | \Phi | $\varphi$ | \varphi | 
| $\varPsi$ | \Psi | ||
| $\varOmega$ | \Omega | 
罗马数字
罗马数字用大写英文字母组合即可,如下例子所示:
| 阿拉伯数字 | 罗马数字 | Tex | 
|---|---|---|
| 1 | $I$ | I | 
| 2 | $II$ | II | 
| 3 | $III$ | III | 
| 4 | $IV$ | IV | 
| 5 | $V$ | V | 
| 6 | $VI$ | VI | 
| 7 | $VII$ | VII | 
| 8 | $VIII$ | VIII | 
| 9 | $IX$ | IX | 
| 10 | $X$ | IX | 
数学符号
括号
| Symbols | Tex | |
|---|---|---|
| 括号 | $[a+(b-c)]$ | [a+(b-c)] | 
| 大括号 | ${a+b}$ | {a+b} | 
| 大括号 | $\lbrace a+b \rbrace$ | \lbrace a+b \rbrace | 
| 括号缩放 | $\left( \cfrac{a+b}{b} \right)$ | \left( \cfrac{a+b}{b} \right) | 
| 括号缩放 | $\left\lbrace \cfrac{a+b}{b} \right\rbrace$ | \left\lbrace \cfrac{a+b}{b} \right\rbrace | 
| 单边缩放 | $\left. \cfrac{a+b}{b} \right\rbrace$ | \left. \cfrac{a+b}{b} \right\rbrace | 
| 尖括号 | $\langle a+b \rangle$ | \langle a+b \rangle | 
| 上取整 | $\lceil a+b \rceil$ | \lceil a+b \rceil | 
| 下取整 | $\lfloor a+b \rfloor$ | \lfloor a+b \rfloor | 
运算
| Symbols | Tex | |
|---|---|---|
| 四则运算 | $\times \div \pm \mp \cdot$ | \times \div \pm \mp \cdot | 
| 分式 | $\frac{a+b}{\frac{b}{c}}$ | \frac{a+b}{\frac{b}{c}} | 
| 分式 | $\cfrac{a+b}{\cfrac{b}{c}}$ | \cfrac{a+b}{\cfrac{b}{c}} | 
| 分式 | ${a+b \over b}$ | {a+b \over b} | 
| 根式 | $\sqrt[4]{a+b}$ | \sqrt[4]{a+b} | 
| 比较 | $\lt \gt \le \ge \neq$ | \lt \gt \le \ge \neq | 
| 比较 | $\approx \sim \cong \equiv \prec$ | \approx \sim \cong \equiv \prec | 
| 排列 | $\binom{n+1}{2k}$ | \binom{n+1}{2k} | 
| 排列 | ${n+1 \choose 2k}$ | {n+1 \choose 2k} | 
| 求和 | $\sum_{i=1}^n$ | \sum_{i=1}^n | 
| 求积 | $\prod\limits_{i=1}^n$ | \prod\limits_{i=1}^n | 
| 积分 | $\int_1^n$ | \int_1^n | 
| 多重积分 | $\iiint_1^n$ | \iiint_1^n | 
| 极限 | $\lim\limits_{n \to \infty}$ | \lim\limits_{n \to \infty} | 
| 模 | $\pmod n$ | \pmod n | 
修饰符
| Symbols | Tex | |
|---|---|---|
| 间隙 | $a , b ; c \quad d \qquad e$ | a , b ; c \quad d \qquad e | 
| 上/下标 | $x_{ij}^2$ | x_{ij}^2 | 
| 底标 | $\underset{i=1}{\Omega}$ | \underset{i=1}{\Omega} | 
| 顶/底标 | $\underset{i=1}{\overset{\infty}{\Omega}}$ | \underset{i=1}{\overset{\infty}{\Omega}} | 
| 顶部符号 | $\hat{x} \overline{x} \dot{x} \ddot{x} \vec{x}$ | \hat{x} \overline{x} \dot{x} \ddot{x} \vec{x} | 
| 顶部符号 | $\tilde{x} \acute{x} \check{x} \grave{x}$ | \tilde{x} \acute{x} \check{x} \grave{x} | 
| 顶部符号 | $\overline{xyz} \widehat{xyz}$ $\overrightarrow{xyz} \widetilde{xyz}$ | \overline{xyz} \widehat{xyz} \overrightarrow{xyz} \widetilde{xyz} | 
| 底部符号 | $\underline{ABC} \underleftrightarrow{ABC}$ | \underline{ABC} \underleftrightarrow{ABC} | 
| 顶部括号 | $\overbrace{(n-1)(n-2)}$ | \overbrace{(n-1)(n-2)} | 
| 底部括号 | $\underbrace{(n-1)(n-2)}_{sum}$ | \underbrace{(n-1)(n-2)}_{sum} | 
| 外框 | $\fbox{OPQ}$ | \fbox{OPQ} | 
| 外框 | $\bbox[green,5px,border:2px solid red]{O+P=Q}$ | \bbox[green,5px,border:2px solid red]{O+P=Q} | 
其它
| Symbols | Tex | |
|---|---|---|
| 省略号 | $\cdots \ldots \ddots \vdots$ | \cdots \ldots \ddots \vdots | 
| 分隔符 | ${x \mid x^2 \in \mathbb{Z}}$ | {x \mid x^2 \in \mathbb{Z}} | 
| 逻辑 | $\land \lor \lnot \forall \exists$ $\top \bot \vdash \vDash$ | \land \lor \lnot \forall \exists \top \bot \vdash \vDash | 
| 集合 | $\cup \cap \setminus \subset \subseteq$ $\subsetneq \supset \in \notin \emptyset$ $\varnothing$ | \cup \cap \setminus \subset \subseteq \subsetneq \supset \in \notin \emptyset \varnothing | 
| 箭头 | $\to \rightarrow \leftarrow$ $\Rightarrow \Leftarrow \mapsto$ | \to \rightarrow \leftarrow \Rightarrow \Leftarrow \mapsto | 
| 其它 | $\star \ast \oplus \circ \bullet$ | \star \ast \oplus \circ \bullet | 
| 其它 | $\spadesuit \heartsuit \diamondsuit \clubsuit$ | \spadesuit \heartsuit \diamondsuit \clubsuit | 
| 其它 | $\infty ; \aleph_o ; \nabla$ $\partial ; \Im ; \Re$ | \infty \aleph_o \nabla \partial \Im \Re | 
表格
\begin{array}{|c|l|c|r}
\hline
num & \text{Left} & \text{Center} & \text{Right} \\
\hline
1 & 0.24 & 1   & 125 \\
\hline
2 & -1   & 189 & -8  \\
\hline
\begin{array}{l|r}
1 & 2 \\
\hline
3 & 4 \\
\end{array}
& -1   & 900 & 1+10i \\
\end{array}
$$
- {|c|l|c|r} 为列对齐方式;
- | 为竖线;
- \hline 为横线;
- & 分隔列;
- \ 分隔行;
$$
\begin{array}{|c|l|c|r}
\hline
num & \text{Left} & \text{Center} & \text{Right} \
\hline
1 & 0.24 & 1   & 125 \
\hline
2 & -1   & 189 & -8  \
\hline
\begin{array}{l|r}
1 & 2 \
\hline
3 & 4 \
\end{array}
& -1   & 900 & 1+10i  \
\end{array}
$$
矩阵
\begin{matrix}
1 & x & x^2 \\
1 & y & y^2 \\
1 & z & z^2 \\
\end{matrix}
,
\begin{pmatrix}
p & p \\
p & p \\
\end{pmatrix}
,
\begin{bmatrix}
b & b \\
b & b \\
\end{bmatrix}
,
\begin{Bmatrix}
B & B \\
B & B \\
\end{Bmatrix}
,
\begin{vmatrix}
v & v \\
v & v \\
\end{vmatrix}
,
\begin{Vmatrix}
V & V \\
V & V \\
\end{Vmatrix}
$$
\begin{matrix}
1 & x & x^2 \
1 & y & y^2 \
1 & z & z^2 \
\end{matrix}
,
\begin{pmatrix}
p & p \
p & p \
\end{pmatrix}
,
\begin{bmatrix}
b & b \
b & b \
\end{bmatrix}
,
\begin{Bmatrix}
B & B \
B & B \
\end{Bmatrix}
,
\begin{vmatrix}
v & v \
v & v \
\end{vmatrix}
,
\begin{Vmatrix}
V & V \
V & V \
\end{Vmatrix}
$$
列式
对齐
$$
\begin{align}
\sqrt{37} &= \sqrt{\cfrac{73^2-1}{12^2}} \\
          &= \sqrt{\cfrac{a}{b}}    \nonumber \\
\end{align}
{\tag {3-1}} {\label {3-1}}
$$
$$
\begin{split}
F &= ma \\
  &= Pv
\end{split}
{\tag {Force}} {\label {3-2}}
$$
- & 为对齐位置;
- \tag 为显示标签;
- \lable 为引用标签(下面会讲);
$$
\begin{align}
\sqrt{37} &= \sqrt{\cfrac{73^2-1}{12^2}} \
          &= \sqrt{\cfrac{a}{b}}    \nonumber \
\end{align}
{\tag {3-1}} {\label {3-1}}
$$
$$
\begin{split}
F &= ma \
  &= Pv
\end{split}
{\tag {Force}} {\label {3-2}}
$$
引用
$\eqref{3-1}$
$\eqref{3-2}$
$\eqref{3-1}$
$\eqref{3-2}$
分类
$$
f(n) =
\begin{cases}
n/2,  & \text{if $n$ is even} \\\[2ex]
3n+1, & \text{if $n$ is odd}  \\
\end{cases}
$$
$$
\left.
\begin{array}{l}
\text{if $n$ is even:} & n/2 \\
\text{if $n$ is odd:} & 3n+1 \\
\end{array}
\right\}
= f(n)
$$
- & 为对齐位置;
- \ 为换行(分类);
- [2ex] 为行间距,1ex为原始距离(若有问题,可换成 [2ex] 试下);
$$
f(n) =
\begin{cases}
n/2,  & \text{if $n$ is even} \[2ex]
3n+1, & \text{if $n$ is odd}  \
\end{cases}
$$
$$
\left.
\begin{array}{l}
\text{if $n$ is even:} & n/2 \
\text{if $n$ is odd:} & 3n+1 \
\end{array}
\right}
= f(n)
$$
方程组
- array实现
$$
\left\{
\begin{array}{c}
a_1x+b_1y+c_1z &= d_1 \\
a_2x+b_2y      &= d_2 \\
a_3x+b_3y+c_3z &= d_3
\end{array}
\right.
$$
$$
\left{
\begin{array}{c}
a_1x+b_1y+c_1z &= d_1 \
a_2x+b_2y      &= d_2 \
a_3x+b_3y+c_3z &= d_3
\end{array}
\right.
$$
- cases实现
$$
\begin{cases}
a_1x+b_1y+c_1z &= d_1 \\
a_2x+b_2y      &= d_2 \\
a_3x+b_3y+c_3z &= d_3
\end{cases}
$$
$$
\begin{cases}
a_1x+b_1y+c_1z &= d_1 \
a_2x+b_2y      &= d_2 \
a_3x+b_3y+c_3z &= d_3
\end{cases}
$$
- aligned实现
$$
\left\{
\begin{aligned}
a_1x+b_1y+c_1z &= d_1 \\
a_2x+b_2y      &= d_2 \\
a_3x+b_3y+c_3z &= d_3
\end{aligned}
\right.
$$
$$
\left{
\begin{aligned}
a_1x+b_1y+c_1z &= d_1 \
a_2x+b_2y      &= d_2 \
a_3x+b_3y+c_3z &= d_3
\end{aligned}
\right.
$$
字体
常规
$$
0123456789-ABCDEFGHIJKLMnopqrstuvwxyz \
\alpha \beta \gamma \delta \epsilon \zeta \eta \theta \iota \kappa \lambda \mu
\nu \xi \omicron \pi \rho \sigma \tau \upsilon \phi \chi \psi \omega
$$
粗体
$$
\boldsymbol{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz} \\
\boldsymbol{\alpha \beta \gamma \delta \epsilon \zeta \eta \theta \iota \kappa \lambda \mu
\nu \xi \omicron \pi \rho \sigma \tau \upsilon \phi \chi \psi \omega}
$$
$$
\boldsymbol{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz} \
\boldsymbol{\alpha \beta \gamma \delta \epsilon \zeta \eta \theta \iota \kappa \lambda \mu
\nu \xi \omicron \pi \rho \sigma \tau \upsilon \phi \chi \psi \omega}
$$
黑板粗体
\mathbb{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz} \\
\Bbb{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
\mathbb{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz} \
\Bbb{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
黑体
\mathbf{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
\mathbf{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
打印机字体
\mathtt{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
\mathtt{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
罗马字体
\mathrm{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
\mathrm{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
手写体
\mathscr{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
\mathscr{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
Fraktur字体
\mathfrak{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
\mathfrak{0123456789-ABCDEFGHIJKLMnopqrstuvwxyz}
$$
颜色
| $\color{black}{test} $ | \color{black}{test} | 
| $\color{red}{test} $ | \color{red}{test} | 
| $\color{blue}{test} $ | \color{blue}{test} | 
| $\color{green}{test} $ | \color{green}{test} | 
| $\color{gray}{test} $ | \color{gray}{test} | 
| $\color{silver}{test} $ | \color{silver}{test} | 
| $\color{white}{test} $ | \color{white}{test} | 
| $\color{maroon}{test} $ | \color{maroon}{test} | 
| $\color{yellow}{test} $ | \color{yellow}{test} | 
| $\color{lime}{test} $ | \color{lime}{test} | 
| $\color{olive}{test} $ | \color{olive}{test} | 
| $\color{teal}{test} $ | \color{teal}{test} | 
| $\color{aqua}{test} $ | \color{aqua}{test} | 
| $\color{navy}{test} $ | \color{navy}{test} | 
| $\color{purple}{test} $ | \color{purple}{test} | 
| $\color{fuchsia}{test}$ | \color{fuchsia}{test} | 
| $\color{magenta}{test}$ | \color{magenta}{test} | 
参考
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