Markdown (LaTeX) 数学公式

https://latex.codecogs.com/eqneditor/editor.php

代码	结果
`a+b`	$a+b$
`x_1^2`	$x_1^2$
`x_{22}`	$x_{22}$
`x^{(n)}`	$x^{(n)}$
`^x^`	$^x^$
`\frac{x+y}{2}`	$\frac{x+y}{2}$
`\frac{1}{1+\frac{1}{2}}`	$\frac{1}{1+\frac{1}{2}}$
`\sqrt[3]{3}`	$\sqrt[3]{3}$
`\sqrt[3]{1+\sqrt[3]{3}}`	$\sqrt[3]{1+\sqrt[3]{3}}$
`\sum_{k=1}^{n} \frac{1}{1+k}`	$\sum_{k=1}^{n} \frac{1}{1+k}$
`lim^{x \to \infty}_{y \to 0}{\frac{x}{y}}`	$\lim^{x \to \infty}_{y \to 0}{\frac{x}{y}}$
`\displaystyle \lim^{x \to \infty}_{y \to 0}{\frac{x}{y}}`	$\displaystyle \lim^{x \to \infty}_{y \to 0}{\frac{x}{y}}$
`\int_{a}^{b} \frac{1}{1+x} dx`	$\int_{a}^{b} \frac{1}{1+x} dx$
`\int_{a}^{b} f(x)dx`	$\int_{a}^{b} f(x)dx$
`\int_a^b f(x) \, dx`	$\int_a^b f(x) \, dx$
`\iint`	$\iint$
`\displaystyle \int`	$\displaystyle \int$
`\partial`	$\partial$
`\pm`	$\pm$
`\mp`	$\mp$
`\times`	$\times$
`\div`	$\div$
`\mid` or `\|`	$\mid$
`\cdot`	$\cdot$
`\ast`	$\ast$
`\forall`	$\forall$
`\exists`	$\exists$
`\nabla`	$\nabla$
`\triangle`	$\triangle$
`\leq`	$\leq$
`\geq`	$\geq$
`\leqslant`	$\leqslant$
`\ngeq`	$\ngeq$
`\approx`	$\approx$
`\neq`	$\neq$
`\infty`	$\infty$
`\cdots`	$\cdots$
`\prod`	$\prod$
`\sim`	$\sim$
`\rightarrow`	$\rightarrow$
`\Rightarrow`	$\Rightarrow$
\xrightarrow[\text{world}]{\text{hello}}	$\xrightarrow[\text{world}]{\text{hello}}$
`\Longrightarrow`	$\Longrightarrow$
`\Leftrightarrow`	$\Leftrightarrow$
`\in`	$\in$
`\notin`	$\notin$
`\subset \supset`	$\subset \supset$
`\subseteq \supseteq`	$\subseteq \supseteq$
`\cup \cap`	$\cup \cap$
`a \! b`	$a\!b$
`a b`	$ab$
`a \, b`	$a\,b$
`a \; b`	$a\;b$
`a\ b`	$a\ b$
`a \quad b`	$a\quad b$
`a \qquad b`	$a\qquad b$
`\vec{a}`	$\vec{a}$
`\dot{x}`	$\dot{x}$
`\ddot{x}`	$\ddot{x}$
`\bar{a}`	$\bar{a}$
`\hat{a}`	$\hat{a}$
`\stackrel{\rm def}{=}`	$\stackrel{\rm def}{=}$
`a \atop =`	$a \atop =$
`a \choose b`	$a \choose b$
`\imath、\jmath`	$\imath、\jmath$
`\overline{xyz}`	$\overline{xyz}$
`\underline{x+y}`	$\underline{x+y}$
`()`	$()$
`[]`	$[]$
`\{ \}`	$\{ \}$
`\lbrace \rbrace`	$\lbrace \rbrace$
`\left\{`	$\left\{ \right\}$
`\langle \rangle`	$\langle \rangle$
`\Bigg( \bigg( \Big( \big( (`	$\Bigg( \bigg( \Big( \big( ($
`\|`	$\\|$
`\because`	$\because$
`\therefore`	$\therefore$
`\left( \sum_{i=1}^n \frac{x^2}{1-x} \right)`	$\left( \sum_{i=1}^n \frac{x^2}{1-x} \right)$
`\begin{matrix} 1&2 \\ 3&4 \end{matrix}`	$\begin{matrix} 1&2 \\ 3&4 \end{matrix}$
`\begin{pmatrix} 1&2 \\ 3&4 \end{pmatrix}`	$\begin{pmatrix} 1&2 \\ 3&4 \end{pmatrix}$
`\begin{bmatrix} 1&2 \\ 3&4 \end{bmatrix}`	$\begin{bmatrix} 1&2 \\ 3&4 \end{bmatrix}$
`\begin{vmatrix} 1&2 \\ 3&4 \end{vmatrix}`	$\begin{vmatrix} 1&2 \\ 3&4 \end{vmatrix}$
`\begin{Vmatrix} 1&2 \\ 3&4 \end{Vmatrix}`	$\begin{Vmatrix} 1&2 \\ 3&4 \end{Vmatrix}$
`\begin{aligned} x = {}& a+b+c+{} \\ &d+e+f+g \end{aligned}`	$\begin{aligned} x = {}& a+b+c+{} \\ &d+e+f+g \end{aligned}$
`\begin{aligned} x = a+b+c+{} \\ &&&&&d+e+f+g \end{aligned}`	$\begin{aligned} x = a+b+c+{} \\ &&&&&d+e+f+g \end{aligned}$
`\overbrace{a+\underbrace{b+c}_{1.0}+d}^{2.0}`	$\overbrace{a+\underbrace{b+c}_{1.0}+d}^{2.0}$
`\alpha`	$\alpha$
`{alpha}`	${alpha}$
`\mbox{what}`	$what$
`\emptyset`	$\emptyset$
`\mathbf{R}`	$\mathbf{R}$
`\mathbb{R}`	$\mathbb{R}$
`\mathcal{R}`	$\mathcal{R}$
`\bullet`	$\bullet$
`\Vert u \Vert_2`	$\Vert u \Vert_2$
`\succeq`	$\succeq$

\mathbf{X} = \left( \begin{matrix}
x\_11 & x\_12 & \ldots \\
x\_21 & x\_22 & \ldots \\
\vdots & \vdots & \ddots
\end{matrix}  \right)

$\mathbf{X} = \left( \begin{matrix} x\_11 & x\_12 & \ldots \\ x\_21 & x\_22 & \ldots \\ \vdots & \vdots & \ddots \end{matrix} \right)$

\mathbf{X} = \left( \begin{array}{ccc}
x_{11} & x_{12} & \ldots \\
x_{21} & x_{22} & \ldots \\
\vdots & \vdots & \ddots
\end{array}
\right)

$\mathbf{X} = \left( \begin{array}{ccc} x_{11} & x_{12} & \ldots \\ x_{21} & x_{22} & \ldots \\ \vdots & \vdots & \ddots \end{array} \right)$

\begin{gathered}
a=b+c+d \\
x=y+z
\end{gathered}

$\begin{gathered} a=b+c+d \\ x=y+z \end{gathered}$

\begin{aligned}
a&=b+c+d \\
x&=y+z
\end{aligned}

$\begin{aligned} a&=b+c+d \\ x&=y+z \end{aligned}$

y=\begin{cases}
-x, \quad x \leq 0 \\
x, \quad x > 0
\end{cases}

$y=\begin{cases} -x, \quad x \leq 0 \\ x, \quad x > 0 \end{cases}$

\left(
\begin{array}{|c|c|}
1&2 \\
\hline 
3&4
\end{array}
\right)

$\left( \begin{array}{|c|c|} 1&2 \\ \hline 3&4 \end{array} \right)$

\begin{array}{|c|c|}
\hline
1&2 \\
\hline
3&4 \\
\hline
\end{array}

$\begin{array}{|c|c|} \hline 1&2 \\ \hline 3&4 \\ \hline \end{array}$