% \f is defined as #1f(#2) using the macro
f\relax(x) = \int_{-\infty}^\infty
    f\hat\xi\,e^{2 \pi i \xi x}
    \,d\xi
基于 KaTeX 在一行
展示示例: `KaTeX:\int_0^\infty x^2 dx`
基于 KaTeX 在一行展示示例: 
| :- | :- | :- | 
|---|---|---|
| a' | \tilde{a} | \mathring{g} | 
| a'' | \widetilde{ac} | \overgroup{AB} | 
| a^{\prime} | \utilde{AB} | \undergroup{AB} | 
| \acute{a} | \vec{F} | \Overrightarrow{AB} | 
| \bar{y} | \overleftarrow{AB} | \overrightarrow{AB} | 
| \breve{a} | \underleftarrow{AB} | \underrightarrow{AB} | 
| \check{a} | \overleftharpoon{ac} | \overrightharpoon{ac} | 
| \dot{a} | \overleftrightarrow{AB} | \overbrace{AB} | 
| \ddot{a} | \underleftrightarrow{AB} | \underbrace{AB} | 
| \grave{a} | \overline{AB} | \overlinesegment{AB} | 
| \hat{\theta} | \underline{AB} | \underlinesegment{AB} | 
| \widehat{ac} | \widecheck{ac} | \underbar{X} | 
| :- | :- | :- | 
|---|---|---|
| \'{a} | \~{a} | |
| \.{a} | \H{a} | |
| \`{a} | \={a} | |
| \"{a} | \v{a} | |
| \^{a} | \u{a} | |
| \r{a} | 
| :- | :- | 
|---|---|
|  | \left(\LARGE{AB}\right) | 
|  | ( \big( \Big( \bigg( \Bigg( | 
| :- | :- | :- | :- | :- | 
|---|---|---|---|---|
| \left | \big | \bigl | \bigm | \bigr | 
| \middle | \Big | \Bigl | \Bigm | \Bigr | 
| \right | \bigg | \biggl | \biggm | \biggr | 
| `` | \Bigg | \Biggl | \Biggm | \Biggr | 
| 预览 | 方法 | 预览 | 方法 | 预览 | 方法 | 预览 | 方法 | 预览 | 方法 | 预览 | 方法 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
|  | \alpha |  | \kappa |  | \psi |  | \digamma |  | \Delta |  | \Theta | 
|  | \beta |  | \lambda |  | \rho |  | \varepsilon |  | \Gamma |  | \Upsilon | 
|  | \chi |  | \mu |  | \sigma |  | \varkappa |  | \Lambda |  | \Xi | 
|  | \delta |  | \nu |  | \tau |  | \varphi |  | \Omega | ||
|  | \epsilon |  | o |  | \theta |  | \varpi |  | \Phi |  | \aleph | 
|  | \eta |  | \omega |  | \upsilon |  | \varrho |  | \Pi |  | \beth | 
|  | \gamma |  | \phi |  | \xi |  | \varsigma |  | \Psi |  | \daleth | 
|  | \iota |  | \pi |  | \zeta |  | \vartheta |  | \Sigma |  | \gimel | 
| 预览 | 方法 | 预览 | 方法 | 预览 | 方法 | 预览 | 方法 | 预览 | 方法 | 
|---|---|---|---|---|---|---|---|---|---|
|  | () |  | \lparen\rparen |  | ⌈ ⌉ |  | \lceil\rceil |  | \uparrow | 
|  | [] |  | \lbrack\rbrack |  | ⌊ ⌋ |  | \lfloor\rfloor |  | \downarrow | 
|  | {} |  | \lbrace\rbrace |  | ⎰⎱ |  | \lmoustache\rmoustache |  | \updownarrow | 
|  | ⟨⟩ |  | \langle\rangle |  | ⟮ ⟯ |  | \lgroup\rgroup |  | \Uparrow | 
|  | | |  | \vert |  | ┌ ┐ |  | \ulcorner\urcorner |  | \Downarrow | 
| ( | \| |  | \Vert |  | └ ┘ |  | \llcorner\lrcorner |  | \Updownarrow | 
|  | \lvert\rvert |  | \lVert\rVert | \left. | \right. |  | \backslash | ||
|  | \lang\rang |  | \lt \gt |  | ⟦ ⟧ |  | \llbracket\rrbracket |  | \lBrace \rBrace | 
\begin{matrix}
   a & b \\
   c & d
\end{matrix}
\begin{array}{cc}
   a & b \\
   c & d
\end{array}
\begin{pmatrix}
   a & b \\
   c & d
\end{pmatrix}
\begin{bmatrix}
   a & b \\
   c & d
\end{bmatrix}
\begin{vmatrix}
   a & b \\
   c & d
\end{vmatrix}
\begin{Vmatrix}
   a & b \\
   c & d
\end{Vmatrix}
\begin{Bmatrix}
   a & b \\
   c & d
\end{Bmatrix}
\def\arraystretch{1.5}
   \begin{array}{c:c:c}
   a & b & c \\ \hline
   d & e & f \\
   \hdashline
   g & h & i
\end{array}
x = \begin{cases}
   a &\text{if } b \\
   c &\text{if } d
\end{cases}
\begin{rcases}
   a &\text{if } b \\
   c &\text{if } d
\end{rcases}⇒…
\begin{smallmatrix}
   a & b \\
   c & d
\end{smallmatrix}
\sum_{
\begin{subarray}{l}
   i\in\Lambda\\
   0<j<n
\end{subarray}}
\begin{equation}
\begin{split}  a &=b+c\\
      &=e+f
\end{split}
\end{equation}
\begin{align}
   a&=b+c \\
   d+e&=f
\end{align}
\begin{gather}
   a=b \\
   e=b+c
\end{gather}
\begin{alignat}{2}
   10&x+&3&y=2\\
   3&x+&13&y=4
\end{alignat}
\begin{CD}
   A @>a>> B \\
@VbVV @AAcA \\
   C @= D
\end{CD}