MarkDown公式符号

空白符

空白符	宽度
$\quad$	1em
$\qquad$	2m
$\!$	-3/18em
$\,$	3/18em
$\:$	4/18em
$\;$	5/18em

希腊字母

名称	大写	书写	小写	书写
Alpha	\(A\)	$A$	\(\alpha\)	$\alpha$
Beta	\(B\)	$B$	\(\beta\)	$\beta$
Gamma	\(\Gamma\)	$\Gamma$	\(\gamma\)	$\gamma$
delta	\(\Delta\)	$\Delta$	\(\delta\)	$\delta$
Epsilon	\(E\)	$E$	\(\epsilon\)	$\epsilon$
Zeta	\(Z\)	$Z$	\(\zeta\)	$\zeta$
eta	\(H\)	$H$	\(\eta\)	$\eta$
theta	\(\Theta\)	$\Theta$	\(\theta\)	$\theta$
iota	\(I\)	$I$	\(\iota\)	$\iota$
kappa	\(K\)	$K$	\(\kappa\)	$\kappa$
Lambda	\(\Lambda\)	$\Lambda$	\(\lambda\)	$\lambda$
Mu	\(M\)	$M$	\(\mu\)	$\mu$
Nu	\(N\)	$N$	\(\nu\)	$\nu$
Xi	\(\Xi\)	$\Xi$	\(\xi\)	$\xi$
Omicron	\(O\)	$O$	\(\omicron\)	$\omicron$
Pi	\(\Pi\)	$\Pi$	\(\pi\)	$\pi$
Rho	\(P\)	$P$	\(\rho\)	$\rho$
Sigma	\(\Sigma\)	$\Sigma$	\(\sigma\)	$\sigma$
Tau	\(T\)	$T$	\(\tau\)	$\tau$
Upsilon	\(\Upsilon\)	$\Upsilon$	\(\upsilon\)	$\upsilon$
Phi	\(\Phi\)	$\Phi$	\(\phi\)	$\phi$
Chi	\(X\)	$X$	\(\chi\)	$\chi$
Psi	\(\Psi\)	$\Psi$	\(\psi\)	$\psi$
Omega	\(\Omega\)	$\Omega$	\(\omega\)	$\omega$

上下标

\(a^{98}_1+a^2_{102}=a^{100}_{103}\)$a^2_1+a^2_{102}=a^{100}_{103}$
^上标<sup>上标</sup>
_下标<sub>下标</sub>

数学符号

符号	书写		符号	书写		符号	书写		符号	书写
+	$+$		-	$-$		\(\ast\)	$ast$		\(\div\)	$\div$
\(\pm\)	$\pm$		\(\mp\)	$\mp$		\(\frac{a}{b}\)	$\frac{a}{b}$		\(a+1 \over b+1\)	$a+1 \over b+1$
\(\sqrt[a]{b}\)	$\sqrt[a]{b}$		\(\surd\)	$\surd$		\(\lfloor x\rfloor\)	$\lfloor x\rfloor$		\(\lceil x\rceil\)	$\lceil x\rceil$
>	$>$		<	$<$		\(\ge\)	$\ge$		\(\le\)	$\le$
\(\sim\)	$\sim$		\(\approx\)	$\approx$		\(\simeq\)	$\simeq$		\(\neq\)	$\neq$
\(\equiv\)	$\equiv$		\(\cong\)	$\cong$
\(\cup\)	$\cup$		\(\cap\)	$\cap$		\(\supset\)	$\supset$		\(\subset\)	$\subset$
\(\in\)	$\in$		\(\ni\)	$\ni$		\(\supseteq\)	$\supseteq$		\(\subseteq\)	$\subseteq$
\(\notin\)	$\notin$		\(\varsupsetneqq\)	$\varsupsetneqq$		\(\varsubsetneqq\)	$\varsubsetneqq$		\(\emptyset\)	$\emptyset$
\(\vee\)	$vee$		\(\wedge\)	$wedge$		\(\lll\)	$\lll$		\(\ggg\)	$\ggg$
\(\oplus\)	$\oplus$		\(\otimes\)	$\otimes$		\(\circ\)	$\circ$		\(\bullet\)	$\bullet$
\(\times\)	$\times$		\(\cdot\)	$\cdot$		\(\bigtriangleup\)	$\bigtriangleup$		\(\bigtriangledown\)	$\bigtriangledown$
\(\nabla\)	$\nabla$		\(\partial\)	$\partial$
\(\because\)	$\because$		\(\therefore\)	$\therefore$		\(\exists\)	$\exists$		\(\forall\)	$\forall$
\(\angle\)	$\angle$		\(\bot\)	$\bot$		\(\parallel\)	$\parallel$
\(\propto\)	$\propto$		\(\infty\)	$\infty
\(\leftarrow\)	$\leftarrow$		\(\rightarrow\)	$\rightarrow$		\(\uparrow\)	$\uparrow$		\(\downarrow\)	$\downarrow$
\(\Leftarrow\)	$\Leftarrow$		\(\Lleftarrow\)	$\Lleftarrow$		\(\leftrightarrow\)	$\leftrightarrow$		\(\updownarrow\)	$\updownarrow$
\(\nwarrow\)	$\nwarrow$		\(\nearrow\)	$\nearrow$		\(\searrow\)	$\searrow$		\(\swarrow\)	$\swarrow$
\(\mid\)	$\mid$		\(\upharpoonright\)	$upharpoonright$		\(\downharpoonright\)	$\downharpoonright$		\(\upharpoonleft\)	$\upharpoonleft$

文本装饰符号

符号	书写		符号	书写		符号	书写		符号	书写
\(\bar{a}\)	$\bar{a}$		\(\acute{a}\)	$\acute{a}$		\(\check{a}\)	$\check{a}$		\(\grave{a}\)	$\grave{a}$
\(\vec{x}\)	$\vec{x}$		\(\hat{y}\)	$\hat{y}$		\(\dot{x}\)	$\dot{x}$		\(\ddot{x}\)	$\ddot{x}$
\(\tilde{x}\)	$\tilde{x}$		\(\breve{x}\)	$\breve{x}$		\(\mathring{x}\)	$\mathring{x}$
\(\overline{ab}\)	$\overline{ab}$		\(\overleftarrow{ab}\)	$\overleftarrow{ab}$		\(\overrightarrow{ab}\)	$\overrightarrow{ab}$		\(\overleftrightarrow{ab}\)	$\overleftrightarrow{ab}$
\(\underline{ab}\)	$\underline{ab}$		\(\underleftarrow{ab}\)	$\underleftarrow{ab}$		\(\underrightarrow{ab}\)	$\underrightarrow{ab}$		\(\underleftrightarrow{ab}\)	$\underleftrightarrow{ab}$
\(\overbrace{xxx}\)	$\overbrace{xxx}$		\(\underbrace{xxx}\)	$\underbrace{xxx}$		\(\widehat{xxx}\)	$\widehat{xxx}$		\(\widetilde{xxx}\)	$\widetilde{xxx}$

大型运算符和矩阵

符号	书写	使用方法	展示
\(\sum\)	$\sum$	$\sum_{i=1}^{n}a_i$	\(\sum_{i=1}^{n}a_i\)
\(\prod\)	$\prod$	$\prod_{i=1}^{n}a_i$	\(\prod_{i=1}^{n}a_i\)
\(\int\)	$\int$	$\int_{a}^{b}f(x)dx$	\(\int_{a}^{b}f(x)dx\)
\(\iint\)	$\iint$	$\iint_{a}^{b}f(x)dx$	\(\iint_{a}^{b}f(x)dx\)
\(\iiint\)	$\iiint$	$\iiint_{a}^{b}f(x)dx$	\(\iiint_{a}^{b}f(x)dx\)
\(\oint\)	$\oint$	$\oint_{a}^{b}f(x)dx$	\(\oint_{a}^{b}f(x)dx\)
\(\bigcap\)	$\bigcap$	$\bigcap_{i=1}^{n}A_i$	\(\bigcap_{i=1}^{n}A_i\)
\(\bigcup\)	$\bigcup$	$\bigcup_{i=1}^{n}A_i$	\(\bigcup_{i=1}^{n}A_i\)
\(\coprod\)	$\coprod$	$\coprod_{i=1}^{n}A_i$	\(\coprod_{i=1}^{n}A_i\)
\(\bigvee\)	$\bigvee$	$\bigvee_{i=1}^{n}A_i$	\(\bigvee_{i=1}^{n}A_i\)
\(\bigwedge\)	$\bigwedge$	$\bigwedge_{i=1}^{n}A_i$	\(\bigwedge_{i=1}^{n}A_i\)
\(\bigsqcup\)	$\bigsqcup$	$\bigsqcup_{i=1}^{n}A_i$	\(\bigsqcup_{i=1}^{n}A_i\)

分段函数

$$
y = \begin{cases}
x+a=b&a>0\\
x+c=d&c<1\\
a+c=b+d
\end{cases}
$$

\[y = \begin{cases} x+a=b&a>0\\ x+c=d&c<1\\ a+c=b+d \end{cases} \]

矩阵

matrix：无框
pmatrix：小括号边框
bmatrix：中括号边框
Bmatrix：大括号边框
vmatrix：单竖线边框
Vmatrix：双竖线边框
$$
\begin{matrix}
1 & \cdots & 4 \\
\vdots & \ddots \\
9 & \dots & 12 \\
\end{matrix}
$$

\[\begin{matrix} 1 & \cdots & 4 \\ \vdots & \ddots \\ 9 & \dots & 12 \\ \end{matrix} \]