latex 数学公式(较全|顺便检测论坛支持性)

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完整文档

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参考维基百科的数学公式教程
参考Cmd Markdown 公式指导手册

本文为 MathJax 在 Markdown 环境下的语法指引。

如何插入公式

\LaTeX 的数学公式有两种:行中公式和独立公式(行间公式)。行中公式放在文中与其它文字混编,独立公式单独成行。

行中公式可以用如下方法表示:

$ 数学公式 $ (本文无法使用单$,已经全替换为$$)

独立公式可以用如下方法表示:

$$ 数学公式 $$

函数、符号及特殊字符

声调 / 变音符号

\dot{a}, \ddot{a}, \acute{a}, \grave{a}

{\displaystyle {\dot {a}},{\ddot {a}},{\acute {a}},{\grave {a}}}

\check{a}, \breve{a}, \tilde{a}, \bar{a}

{\displaystyle {\check {a}},{\breve {a}},{\tilde {a}},{\bar {a}}}

\hat{a}, \widehat{a}, \vec{a}

{\displaystyle {\hat {a}},{\widehat {a}},{\vec {a}}}

标准函数

指数

\exp_a b = a^b, \exp b = \mathrm{e}^b, 10^m

{\displaystyle \exp _{a}b=a^{b},\exp b=\mathrm{e}^{b},10^{m}}

对数

\ln c, \lg d, \log \mathrm{e}, \log_{10} f

{\displaystyle \ln c,\lg d,\log e,\log _{10}f}

三角函数

\sin a, \cos b, \tan c, \cot d, \sec e, \csc f

{\displaystyle \sin a,\cos b,\tan c,\cot d,\sec e,\csc f}

\arcsin a, \arccos b, \arctan c

{\displaystyle \arcsin a,\arccos b,\arctan c}

\arccot d, \arcsec e, \arccsc f

{\displaystyle \operatorname {arccot} d,\operatorname {arcsec} e,\operatorname {arccsc} f}

\sinh a, \cosh b, \tanh c, \coth d

{\displaystyle \sinh a,\cosh b,\tanh c,\coth d}

\operatorname{sh}k, \operatorname{ch}l, \operatorname{th}m, \operatorname{coth}n

{\displaystyle \operatorname {sh} k,\operatorname {ch} l,\operatorname {th} m,\operatorname {coth} n}

\operatorname{argsh}o, \operatorname{argch}p, \operatorname{argth}q

{\displaystyle \operatorname {argsh} o,\operatorname {argch} p,\operatorname {argth} q}

符号函数,绝对值

\sgn r, \left\vert s \right\vert\lvert s \rvert\left| s \right|

{\displaystyle \operatorname {sgn} r,\left\vert s\right\vert }

最大值,最小值

\min(x,y), \max(x,y)

{\displaystyle \min(x,y),\max(x,y)}

界限,极限

\min x, \max y, \inf s, \sup t

{\displaystyle \min x,\max y,\inf s,\sup t}

\lim u, \liminf v, \limsup w

{\displaystyle \lim u,\liminf v,\limsup w}

\lim_{x \to \infty} \frac{1}{n(n+1)}

{\displaystyle \lim_{x \to \infty} \frac{1}{n(n+1)}}

\dim p, \deg q, \det m, \ker\phi

{\displaystyle \dim p,\deg q,\det m,\ker \phi}

投射

\Pr j, \hom l, \lVert z \rVert, \arg z

{\displaystyle \Pr j,\hom l,\lVert z\rVert ,\arg z}

微分及导数

dt, \mathrm{d}t, \partial t, \nabla\psi

{\displaystyle dt,\mathrm {d} t,\partial t,\nabla \psi }

dy/dx, \mathrm{d}y/\mathrm{d}x, \frac{dy}{dx}, \frac{\mathrm{d}y}{\mathrm{d}x}, \frac{\partial^2}{\partial x_1\partial x_2}y

{\displaystyle dy/dx,\mathrm {d} y/\mathrm {d} x,{\frac {dy}{dx}},{\frac {\mathrm {d} y}{\mathrm {d} x}},{\frac {\partial ^{2}}{\partial x_{1}\partial x_{2}}}y}

\prime, \backprime, f^\prime, f', f'', f^{(3)}, \dot y, \ddot y

{\displaystyle \prime ,\backprime ,f^{\prime},f’,f’’,f^{(3)}!,{\dot {y}},{\ddot {y}}}

类字母符号及常数

\infty, \aleph, \complement, \backepsilon, \eth, \Finv, \hbar

{\displaystyle \infty ,\aleph ,\complement ,\backepsilon ,\eth ,\Finv ,\hbar}

\Im, \imath, \jmath, \Bbbk, \ell, \mho, \wp, \Re, \circledS

{\displaystyle \Im ,\imath ,\jmath ,\Bbbk ,\ell ,\mho ,\wp ,\Re ,\circledS }

模运算

s_k \equiv 0 \pmod{m}

{\displaystyle s_{k}\equiv 0{\pmod {m}}}

a \bmod b

{\displaystyle a \bmod b}

\gcd(m, n), \operatorname{lcm}(m, n)

{\displaystyle \gcd(m,n),\operatorname {lcm} (m,n)}

\mid, \nmid, \shortmid, \nshortmid

{\displaystyle \mid ,\nmid ,\shortmid ,\nshortmid}

根号

\surd, \sqrt{2}, \sqrt[n]{}, \sqrt[3]{\frac{x^3+y^3}{2}}

{\displaystyle \surd ,{\sqrt {2}},{\sqrt[{n}]{}},{\sqrt[{3}]{\frac {x^{3}+y^{3}}{2}}}}

运算符

+, -, \pm, \mp, \dotplus

{\displaystyle +,-,\pm ,\mp ,\dotplus}

\times, \div, \divideontimes, /, \backslash

{\displaystyle \times ,\div ,\divideontimes ,/,\backslash}

\cdot, * \ast, \star, \circ, \bullet

{\displaystyle \cdot ,*\ast ,\star ,\circ ,\bullet}

\boxplus, \boxminus, \boxtimes, \boxdot

{\displaystyle \boxplus ,\boxminus ,\boxtimes ,\boxdot}

\oplus, \ominus, \otimes, \oslash, \odot

{\displaystyle \oplus ,\ominus ,\otimes ,\oslash ,\odot}

\circleddash, \circledcirc, \circledast

{\displaystyle \circleddash ,\circledcirc ,\circledast}

\bigoplus, \bigotimes, \bigodot

{\displaystyle \bigoplus ,\bigotimes ,\bigodot}

集合 {id=”set”}

\{ \}, \O \empty \emptyset, \varnothing

{\displaystyle {},\emptyset \emptyset \emptyset ,\varnothing }

\in, \notin \not\in, \ni, \not\ni

{\displaystyle \in ,\notin \not \in ,\ni ,\not \ni}

\cap, \Cap, \sqcap, \bigcap

{\displaystyle \cap ,\Cap ,\sqcap ,\bigcap}

\cup, \Cup, \sqcup, \bigcup, \bigsqcup, \uplus, \biguplus

{\displaystyle \cup ,\Cup ,\sqcup ,\bigcup ,\bigsqcup ,\uplus ,\biguplus}

\setminus, \smallsetminus, \times

{\displaystyle \setminus ,\smallsetminus ,\times}

\subset, \Subset, \sqsubset

{\displaystyle \subset ,\Subset ,\sqsubset}

\supset, \Supset, \sqsupset

{\displaystyle \supset ,\Supset ,\sqsupset}

\subseteq, \nsubseteq, \subsetneq, \varsubsetneq, \sqsubseteq

{\displaystyle \subseteq ,\nsubseteq ,\subsetneq ,\varsubsetneq ,\sqsubseteq}

\supseteq, \nsupseteq, \supsetneq, \varsupsetneq, \sqsupseteq

{\displaystyle \supseteq ,\nsupseteq ,\supsetneq ,\varsupsetneq ,\sqsupseteq}

\subseteqq, \nsubseteqq, \subsetneqq, \varsubsetneqq

{\displaystyle \subseteqq ,\nsubseteqq ,\subsetneqq ,\varsubsetneqq}

\supseteqq, \nsupseteqq, \supsetneqq, \varsupsetneqq

{\displaystyle \supseteqq ,\nsupseteqq ,\supsetneqq ,\varsupsetneqq}

关系符号

=, \ne, \neq, \equiv, \not\equiv

{\displaystyle =,\neq ,\neq ,\equiv ,\not \equiv}

\doteq, \doteqdot, \overset{\underset{\mathrm{def}}{}}{=}, :=

{\displaystyle \doteq ,\doteqdot ,{\overset {\underset {\mathrm {def} }{}}{=}},:=}

\sim, \nsim, \backsim, \thicksim, \simeq, \backsimeq, \eqsim, \cong, \ncong

{\displaystyle \sim ,\nsim ,\backsim ,\thicksim ,\simeq ,\backsimeq ,\eqsim ,\cong ,\ncong}

\approx, \thickapprox, \approxeq, \asymp, \propto, \varpropto

{\displaystyle \approx ,\thickapprox ,\approxeq ,\asymp ,\propto ,\varpropto}

<, \nless, \ll, \not\ll, \lll, \not\lll, \lessdot

{\displaystyle <,\nless ,\ll ,\not \ll ,\lll ,\not \lll ,\lessdot}

>, \ngtr, \gg, \not\gg, \ggg, \not\ggg, \gtrdot

{\displaystyle>,\ngtr ,\gg ,\not \gg ,\ggg ,\not \ggg ,\gtrdot }

\le, \leq, \lneq, \leqq, \nleq, \nleqq, \lneqq, \lvertneqq

{\displaystyle \leq ,\leq ,\lneq ,\leqq ,\nleq ,\nleqq ,\lneqq ,\lvertneqq}

\ge, \geq, \gneq, \geqq, \ngeq, \ngeqq, \gneqq, \gvertneqq

{\displaystyle \geq ,\geq ,\gneq ,\geqq ,\ngeq ,\ngeqq ,\gneqq ,\gvertneqq}

\lessgtr, \lesseqgtr, \lesseqqgtr, \gtrless, \gtreqless, \gtreqqless

{\displaystyle \lessgtr ,\lesseqgtr ,\lesseqqgtr ,\gtrless ,\gtreqless ,\gtreqqless}

\leqslant, \nleqslant, \eqslantless

{\displaystyle \leqslant ,\nleqslant ,\eqslantless}

\geqslant, \ngeqslant, \eqslantgtr

{\displaystyle \geqslant ,\ngeqslant ,\eqslantgtr}

\lesssim, \lnsim, \lessapprox, \lnapprox

{\displaystyle \lesssim ,\lnsim ,\lessapprox ,\lnapprox}

\gtrsim, \gnsim, \gtrapprox, \gnapprox

{\displaystyle \gtrsim ,\gnsim ,\gtrapprox ,\gnapprox}

\prec, \nprec, \preceq, \npreceq, \precneqq

{\displaystyle \prec ,\nprec ,\preceq ,\npreceq ,\precneqq}

\succ, \nsucc, \succeq, \nsucceq, \succneqq

{\displaystyle \succ ,\nsucc ,\succeq ,\nsucceq ,\succneqq}

\preccurlyeq, \curlyeqprec

{\displaystyle \preccurlyeq ,\curlyeqprec}

\succcurlyeq, \curlyeqsucc

{\displaystyle \succcurlyeq ,\curlyeqsucc}

\precsim, \precnsim, \precapprox, \precnapprox

{\displaystyle \precsim ,\precnsim ,\precapprox ,\precnapprox}

\succsim, \succnsim, \succapprox, \succnapprox

{\displaystyle \succsim ,\succnsim ,\succapprox ,\succnapprox}

几何符号

\parallel, \nparallel, \shortparallel, \nshortparallel

{\displaystyle \parallel ,\nparallel ,\shortparallel ,\nshortparallel}

\perp, \angle, \sphericalangle, \measuredangle, 45^\circ

{\displaystyle \perp ,\angle ,\sphericalangle ,\measuredangle ,45^{\circ}}

\Box, \blacksquare, \diamond, \Diamond \lozenge, \blacklozenge, \bigstar

{\displaystyle \Box ,\blacksquare ,\diamond ,\Diamond \lozenge ,\blacklozenge ,\bigstar}

\bigcirc, \triangle, \bigtriangleup, \bigtriangledown

{\displaystyle \bigcirc ,\triangle ,\bigtriangleup ,\bigtriangledown}

\vartriangle, \triangledown

{\displaystyle \vartriangle ,\triangledown}

\blacktriangle, \blacktriangledown, \blacktriangleleft, \blacktriangleright

{\displaystyle \blacktriangle ,\blacktriangledown ,\blacktriangleleft ,\blacktriangleright}

逻辑符号

\forall, \exists, \nexists

{\displaystyle \forall ,\exists ,\nexists}

\therefore, \because, \And

{\displaystyle \therefore ,\because ,\And}

\or \lor \vee, \curlyvee, \bigvee

{\displaystyle \lor ,\lor ,\vee ,\curlyvee ,\bigvee}

\and \land \wedge, \curlywedge, \bigwedge

{\displaystyle \land ,\land ,\wedge ,\curlywedge ,\bigwedge}

\bar{q}, \bar{abc}, \overline{q}, \overline{abc},

\lnot \neg, \not\operatorname{R}, \bot, \top

{\displaystyle {\bar {q}},{\bar {abc}},{\overline {q}},{\overline {abc}},}

{\displaystyle \lnot \neg ,\not \operatorname {R} ,\bot ,\top }

\vdash \dashv, \vDash, \Vdash, \models

{\displaystyle \vdash ,\dashv ,\vDash ,\Vdash ,\models}

\Vvdash \nvdash \nVdash \nvDash \nVDash

{\displaystyle \Vvdash ,\nvdash ,\nVdash ,\nvDash ,\nVDash}

\ulcorner \urcorner \llcorner \lrcorner

{\displaystyle \ulcorner \urcorner \llcorner \lrcorner}

箭头

\Rrightarrow, \Lleftarrow

{\displaystyle \Rrightarrow ,\Lleftarrow}

\Rightarrow, \nRightarrow, \Longrightarrow \implies

{\displaystyle \Rightarrow ,\nRightarrow ,\Longrightarrow ,\implies}

\Leftarrow, \nLeftarrow, \Longleftarrow

{\displaystyle \Leftarrow ,\nLeftarrow ,\Longleftarrow}

\Leftrightarrow, \nLeftrightarrow, \Longleftrightarrow \iff

{\displaystyle \Leftrightarrow ,\nLeftrightarrow ,\Longleftrightarrow \iff}

\Uparrow, \Downarrow, \Updownarrow

{\displaystyle \Uparrow ,\Downarrow ,\Updownarrow}

\rightarrow \to, \nrightarrow, \longrightarrow

{\displaystyle \rightarrow \to ,\nrightarrow ,\longrightarrow}

\leftarrow \gets, \nleftarrow, \longleftarrow

{\displaystyle \leftarrow \gets ,\nleftarrow ,\longleftarrow}

\leftrightarrow, \nleftrightarrow, \longleftrightarrow

{\displaystyle \leftrightarrow ,\nleftrightarrow ,\longleftrightarrow}

\uparrow, \downarrow, \updownarrow

{\displaystyle \uparrow ,\downarrow ,\updownarrow}

\nearrow, \swarrow, \nwarrow, \searrow

{\displaystyle \nearrow ,\swarrow ,\nwarrow ,\searrow}

\mapsto, \longmapsto

{\displaystyle \mapsto ,\longmapsto}

\rightharpoonup \rightharpoondown \leftharpoonup \leftharpoondown \upharpoonleft \upharpoonright \downharpoonleft \downharpoonright \rightleftharpoons \leftrightharpoons

{\displaystyle \rightharpoonup ,\rightharpoondown ,\leftharpoonup ,\leftharpoondown ,\upharpoonleft ,\upharpoonright ,\downharpoonleft ,\downharpoonright ,\rightleftharpoons ,\leftrightharpoons}

\curvearrowleft \circlearrowleft \Lsh \upuparrows \rightrightarrows \rightleftarrows \rightarrowtail \looparrowright

{\displaystyle \curvearrowleft ,\circlearrowleft ,\Lsh ,\upuparrows ,\rightrightarrows ,\rightleftarrows ,\rightarrowtail ,\looparrowright}

\curvearrowright \circlearrowright \Rsh \downdownarrows \leftleftarrows \leftrightarrows \leftarrowtail \looparrowleft

{\displaystyle \curvearrowright ,\circlearrowright ,\Rsh ,\downdownarrows ,\leftleftarrows ,\leftrightarrows ,\leftarrowtail ,\looparrowleft}

\hookrightarrow \hookleftarrow \multimap \leftrightsquigarrow \rightsquigarrow \twoheadrightarrow \twoheadleftarrow

{\displaystyle \hookrightarrow ,\hookleftarrow ,\multimap ,\leftrightsquigarrow ,\rightsquigarrow ,\twoheadrightarrow ,\twoheadleftarrow}

特殊符号

省略号:数学公式中常见的省略号有两种,\ldots 表示与文本底线对齐的省略号,\cdots 表示与文本中线对齐的省略号。

\amalg \% \dagger \ddagger \ldots \cdots

{\displaystyle \amalg \%\dagger \ddagger \ldots \cdots}

\smile \frown \wr \triangleleft \triangleright

{\displaystyle \smile \frown \wr \triangleleft \triangleright}

\diamondsuit, \heartsuit, \clubsuit, \spadesuit, \Game, \flat, \natural, \sharp

{\displaystyle \diamondsuit ,\heartsuit ,\clubsuit ,\spadesuit ,\Game ,\flat ,\natural ,\sharp}

未分类

\diagup \diagdown \centerdot \ltimes \rtimes \leftthreetimes \rightthreetimes

{\displaystyle \diagup ,\diagdown ,\centerdot ,\ltimes ,\rtimes ,\leftthreetimes ,\rightthreetimes}

\eqcirc \circeq \triangleq \bumpeq \Bumpeq \doteqdot \risingdotseq \fallingdotseq

{\displaystyle \eqcirc ,\circeq ,\triangleq ,\bumpeq ,\Bumpeq ,\doteqdot ,\risingdotseq ,\fallingdotseq}

\intercal \barwedge \veebar \doublebarwedge \between \pitchfork

{\displaystyle \intercal ,\barwedge ,\veebar ,\doublebarwedge ,\between ,\pitchfork}

\vartriangleleft \ntriangleleft \vartriangleright \ntriangleright

{\displaystyle \vartriangleleft ,\ntriangleleft ,\vartriangleright ,\ntriangleright}

\trianglelefteq \ntrianglelefteq \trianglerighteq \ntrianglerighteq

{\displaystyle \trianglelefteq ,\ntrianglelefteq ,\trianglerighteq ,\ntrianglerighteq}

关于这些符号的更多语义,参阅 TeX Cookbook 的简述。

上标、下标及积分等

功能|语法|效果

^ 表示上标, _ 表示下标。如果上下标的内容多于一个字符,需要用 {} 将这些内容括成一个整体。上下标可以嵌套,也可以同时使用。

上标

a^2

{\displaystyle a^{2}}

下标

a_2

{\displaystyle a_{2}}

组合

a^{2+2}

{\displaystyle a^{2+2}}

a_{i,j}

{\displaystyle a_{i,j}}

结合上下标

x_2^3

{\displaystyle x_{2}^{3}}

前置上下标

{}_1^2\!X_3^4

{\displaystyle {}{1}^{2}!X{3}^{4}}

导数(HTML

x'

{\displaystyle x’}

导数(PNG

x^\prime

{\displaystyle x^{\prime}}

导数(错误

x\prime

{\displaystyle x\prime}

导数点

\dot{x}

{\displaystyle {\dot {x}}}

\ddot{y}

{\displaystyle {\ddot {y}}}

向量

\vec{c}(只有一个字母)

{\displaystyle {\vec {c}}}

\overleftarrow{a b}

{\displaystyle {\overleftarrow {ab}}}

\overrightarrow{c d}

{\displaystyle {\overrightarrow {cd}}}

\overleftrightarrow{a b}

{\displaystyle {\overleftrightarrow {ab}}}

\widehat{e f g}

{\displaystyle {\widehat {efg}}}

上弧

(注: 正确应该用 \overarc,但在这里行不通。要用建议的语法作为解决办法。)(使用 \ overarc 时需要引入 {arcs} 包。)

\overset{\frown} {AB}

{\displaystyle {\overset {\frown}{AB}}}

上划线

\overline{h i j}

{\displaystyle {\overline {hij}}}

下划线

\underline{k l m}

{\displaystyle {\underline {klm}}}

上括号

\overbrace{1+2+\cdots+100}

{\displaystyle \overbrace {1+2+\cdots +100} }

\begin{matrix} 5050 \\\\ \overbrace{ 1+2+\cdots+100 } \end{matrix}

{\displaystyle {\begin{matrix}5050\\\overbrace {1+2+\cdots +100} \end{matrix}}}

下括号

\underbrace{a+b+\cdots+z}

{\displaystyle \underbrace {a+b+\cdots +z} }

\begin{matrix} \underbrace{ a+b+\cdots+z } \\\\ 26 \end{matrix}

{\displaystyle {\begin{matrix}\underbrace {a+b+\cdots +z} \\26\end{matrix}}}

求和(累加)

\sum_{k=1}^N k^2

{\displaystyle \sum _{k=1}^{N}k^{2}}

\begin{matrix} \sum_{k=1}^N k^2 \end{matrix}

{\displaystyle {\begin{matrix}\sum _{k=1}^{N}k^{2}\end{matrix}}}

求积(累乘)

\prod_{i=1}^N x_i

{\displaystyle \prod {i=1}^{N}x{i}}

\begin{matrix} \prod_{i=1}^N x_i \end{matrix}

{\displaystyle {\begin{matrix}\prod {i=1}^{N}x{i}\end{matrix}}}

上积

\coprod_{i=1}^N x_i

{\displaystyle \coprod {i=1}^{N}x{i}}

\begin{matrix} \coprod_{i=1}^N x_i \end{matrix}

{\displaystyle {\begin{matrix}\coprod {i=1}^{N}x{i}\end{matrix}}}

极限

\lim_{n \to \infty}x_n

{\displaystyle \lim {n\to \infty}x{n}}

\begin{matrix} \lim_{n \to \infty}x_n \end{matrix}

{\displaystyle {\begin{matrix}\lim {n\to \infty }x{n}\end{matrix}}}

积分

\int_{-N}^{N} e^x\, {\rm d}x

{\displaystyle \int _{-N}^{N}e^{x},{\rm d} x}

本例中 \,{\rm d} 部分可省略,但建议加入,能使式子更美观。{\rm d}可以用\mathrm{d}等价替换。

\begin{matrix} \int_{-N}^{N} e^x\, \mathrm{d}x \end{matrix}(矩阵中积分符号变小)

{\displaystyle {\begin{matrix}\int _{-N}^{N}e^{x},\mathrm {d} x\end{matrix}}}

双重积分

\iint_{D}^{W} \, \mathrm{d}x\,\mathrm{d}y

{\displaystyle \iint _{D}^{W},\mathrm {d} x,\mathrm {d} y}

三重积分

\iiint_{E}^{V} \, \mathrm{d}x\,\mathrm{d}y\,\mathrm{d}z

{\displaystyle \iiint _{E}^{V},\mathrm {d} x,\mathrm {d} y,\mathrm {d} z}

闭合的曲线、曲面积分

\oint_{C} x^3\, \mathrm{d}x + 4y^2\, \mathrm{d}y

{\displaystyle \oint _{C}x^{3},\mathrm {d} x+4y^{2},\mathrm {d} y}

交集

\bigcap_1^{n} p

{\displaystyle \bigcap _{1}^{n}p}

并集

\bigcup_1^{k} p

{\displaystyle \bigcup _{1}^{k}p}

分数

通常使用 \frac {分子} {分母} 命令产生一个分数,分数可嵌套。
便捷情况可直接输入 \frac ab 来快速生成一个 $\frac ab$ 。
如果分式很复杂,亦可使用 分子 \over 分母 命令,此时分数仅有一层。

功能|语法|效果

分数

\frac{2}{4}=0.5

{\displaystyle {\frac {2}{4}}=0.5}

小型分数

\tfrac{2}{4} = 0.5

{\displaystyle {\tfrac {2}{4}}=0.5}

连分式(大型嵌套分式)

\cfrac{2}{c + \cfrac{2}{d + \cfrac{2}{4}}} = a

{\displaystyle {\cfrac {2}{c+{\cfrac {2}{d+{\cfrac {2}{4}}}}}}=a}

大型不嵌套分式

\dfrac{2}{4} = 0.5 \qquad \dfrac{2}{c + \dfrac{2}{d + \dfrac{2}{4}}} = a

{\displaystyle {\dfrac {2}{4}}=0.5\qquad {\dfrac {2}{c+{\dfrac {2}{d+{\dfrac {2}{4}}}}}}=a}

二项式系数

\dbinom{n}{r}=\binom{n}{n-r}=\mathrm{C}_n^r=\mathrm{C}_n^{n-r}

{\displaystyle {\dbinom {n}{r}}={\binom {n}{n-r}}=\mathrm {C} _{n}^{r}=\mathrm {C} _{n}^{n-r}}

小型二项式系数

\tbinom{n}{r}=\tbinom{n}{n-r}=\mathrm{C}_n^r=\mathrm{C}_n^{n-r}

{\displaystyle {\tbinom {n}{r}}={\tbinom {n}{n-r}}=\mathrm {C} _{n}^{r}=\mathrm {C} _{n}^{n-r}}

大型二项式系数

\binom{n}{r}=\dbinom{n}{n-r}=\mathrm{C}_n^r=\mathrm{C}_n^{n-r}

{\displaystyle {\binom {n}{r}}={\dbinom {n}{n-r}}=\mathrm {C} _{n}^{r}=\mathrm {C} _{n}^{n-r}}

在以e为底的指数函数、极限和积分中尽量不要使用 \frac 符号:它会使整段函数看起来很怪,而且可能产生歧义。也正是因此它在专业数学排版中几乎从不出现。
横着写这些分式,中间使用斜线间隔 / (用斜线代替分数线)。

  • 例子:
\begin{array}{cc}
\mathrm{Bad} & \mathrm{Better} \\\\
\hline \\\\
e^{i\frac{\pi}2} \quad e^{\frac{i\pi}2}& e^{i\pi/2} \\\\
\int_{-\frac\pi2}^\frac\pi2 \sin x\,dx & \int_{-\pi/2}^{\pi/2}\sin x\,dx \\\\
\end{array}
  • 显示:
    $$
    \begin{array}{cc}
    \mathrm{Bad} & \mathrm{Better} \\
    \hline \\
    e^{i\frac{\pi}2} \quad e^{\frac{i\pi}2}& e^{i\pi/2} \\
    \int_{-\frac\pi2}^\frac\pi2 \sin x,dx & \int_{-\pi/2}^{\pi/2}\sin x,dx \\
    \end{array}
    $$

矩阵、条件表达式、方程组

语法:

\begin{类型}
公式内容
\end{类型}

类型可以是:矩阵 matrix pmatrix bmatrix Bmatrix vmatrix Vmatrix、条件表达式 cases、多行对齐方程式 aligned、数组 array

在公式内容中:在每一行中插入 & 来指定需要对齐的内容,在每行结尾处使用 \\\\ 换行

无框矩阵

在开头使用 begin{matrix},在结尾使用 end{matrix},在中间插入矩阵元素,每个元素之间插入 & ,并在每行结尾处使用 \\\\

\begin{matrix}
x & y \\\\
z & v
\end{matrix}

{\displaystyle {\begin{matrix}x&y\\z&v\end{matrix}}}

有框矩阵

在开头将 matrix 替换为 pmatrix bmatrix Bmatrix vmatrix Vmatrix

\begin{vmatrix}
x & y \\\\
z & v
\end{vmatrix}

{\displaystyle {\begin{vmatrix}x&y\\z&v\end{vmatrix}}}

\begin{Vmatrix}
x & y \\\\
z & v
\end{Vmatrix}

{\displaystyle {\begin{Vmatrix}x&y\\z&v\end{Vmatrix}}}

使用 \cdots $\cdots$ , \ddots $\ddots$ , \vdots $\vdots$ 来输入省略符号

\begin{bmatrix}
0      & \cdots & 0      \\\\
\vdots & \ddots & \vdots \\\\
0      & \cdots & 0
\end{bmatrix}

{\displaystyle {\begin{bmatrix}0&\cdots &0\\\vdots &\ddots &\vdots \\0&\cdots &0\end{bmatrix}}}

\begin{Bmatrix}
x & y \\\\
z & v
\end{Bmatrix}

{\displaystyle {\begin{Bmatrix}x&y\\z&v\end{Bmatrix}}}

\begin{pmatrix}
x & y \\\\
z & v
\end{pmatrix}

{\displaystyle {\begin{pmatrix}x&y\\z&v\end{pmatrix}}}

条件表达式

f(n) =
\begin{cases} 
n/2,  & \text{if }n\text{ is even} \\\\
3n+1, & \text{if }n\text{ is odd}
\end{cases}

{\displaystyle f(n)={\begin{cases}n/2,&{\text{if }}n{\text{ is even}}\\3n+1,&{\text{if }}n{\text{ is odd}}\end{cases}}}

多行等式、同余式

人们经常想要一列整齐且居中的方程式序列。使用 \begin{aligned}…\end{aligned}

\begin{aligned}
f(x) & = (m+n)^2 \\\\
     & = m^2+2mn+n^2 \\\\
\end{aligned}

{\displaystyle {\begin{aligned}f(x)&=(m+n)^{2}\\&=m^{2}+2mn+n^{2}\\\end{aligned}}}

begin{aligned}
3^{6n+3}+4^{6n+3} 
& \equiv (3^3)^{2n+1}+(4^3)^{2n+1}\\\\  
& \equiv 27^{2n+1}+64^{2n+1}\\\\  
& \equiv 27^{2n+1}+(-27)^{2n+1}\\\\ 
& \equiv 27^{2n+1}-27^{2n+1}\\\\
& \equiv 0 \pmod{91}\\\\
\end{aligned}

{\displaystyle {\begin{aligned}3^{6n+3}+4^{6n+3}&\equiv (3^{3})^{2n+1}+(4^{3})^{2n+1}\\&\equiv 27^{2n+1}+64^{2n+1}\\&\equiv 27^{2n+1}+(-27)^{2n+1}\\&\equiv 27^{2n+1}-27^{2n+1}\\&\equiv 0{\pmod {91}}\\\end{aligned}}}

\begin{alignedat}{3}
f(x) & = (m-n)^2 \\\\
f(x) & = (-m+n)^2 \\\\
     & = m^2-2mn+n^2 \\\\
\end{alignedat}

{\displaystyle {\begin{alignedat}{3}f(x)&=(m-n)^{2}\\f(x)&=(-m+n)^{2}\\&=m^{2}-2mn+n^{2}\\\end{alignedat}}}

方程组

\begin{cases}
3x + 5y +  z \\\\
7x - 2y + 4z \\\\
-6x + 3y + 2z
\end{cases}


{\displaystyle {\begin{cases}3x+5y+z\\7x-2y+4z\\-6x+3y+2z\end{cases}}}

\left\{\begin{aligned}
3x + 5y +  z \\\\
7x - 2y + 4z \\\\
-6x + 3y + 2z
\end{aligned}\right.


\left{\begin{aligned}
3x + 5y + z \\
7x - 2y + 4z \\
-6x + 3y + 2z
\end{aligned}\right.

数组与表格

通常,一个格式化后的表格比单纯的文字或排版后的文字更具有可读性。数组和表格均以 \begin{array} 开头,并在其后定义列数及每一列的文本对齐属性,c l r 分别代表居中、左对齐及右对齐。若需要插入垂直分割线,在定义式中插入 | ,若要插入水平分割线,在下一行输入前插入 \hline 。与矩阵相似,每行元素间均须要插入 & ,每行元素以 \\\\ 结尾,最后以 \end{array} 结束数组。

  • 例子:
\begin{array}{c|lcr}
n & \text{左对齐} & \text{居中对齐} & \text{右对齐} \\\\
\hline
1 & 0.24 & 1 & 125 \\\\
2 & -1 & 189 & -8 \\\\
3 & -20 & 2000 & 1+10i
\end{array}
  • 显示:

    \begin{array}{c|lcr}
    n & \text{左对齐} & \text{居中对齐} & \text{右对齐} \\
    \hline
    1 & 0.24 & 1 & 125 \\
    2 & -1 & 189 & -8 \\
    3 & -20 & 2000 & 1+10i
    \end{array}

  • 例子:

\begin{array}{lcl}
z        & = & a \\\\
f(x,y,z) & = & x + y + z 
\end{array}
  • 显示:

{\displaystyle {\begin{array}{lcl}z&=&a\\f(x,y,z)&=&x+y+z\end{array}}}

  • 例子:
\begin{array}{lcr}
z        & = & a \\\\
f(x,y,z) & = & x + y + z    
\end{array}
  • 显示:

{\displaystyle {\begin{array}{lcr}z&=&a\\f(x,y,z)&=&x+y+z\end{array}}}

  • 例子:
\begin{array}{ccc}
a & b & S \\\\
\hline
0&0&1\\\\
0&1&1\\\\
1&0&1\\\\
1&1&0\\\\
\end{array}
  • 显示:


{\displaystyle {\begin{array}{ccc}a&b&S\\\hline 0&0&1\\0&1&1\\1&0&1\\1&1&0\\\end{array}}}

嵌套数组或表格

多个数组/表格可 互相嵌套 并组成一组数组/一组表格。
使用嵌套前必须声明 $$ 符号。

  • 例子:
% outer vertical array of arrays 外层垂直表格
\begin{array}{c}
    % inner horizontal array of arrays 内层水平表格
    \begin{array}{cc}
        % inner array of minimum values 内层"最小值"数组
        \begin{array}{c|cccc}
        \text{min} & 0 & 1 & 2 & 3\\\\
        \hline
        0 & 0 & 0 & 0 & 0\\\\
        1 & 0 & 1 & 1 & 1\\\\
        2 & 0 & 1 & 2 & 2\\\\
        3 & 0 & 1 & 2 & 3
        \end{array}
    &
        % inner array of maximum values 内层"最大值"数组
        \begin{array}{c|cccc}
        \text{max}&0&1&2&3\\\\
        \hline
        0 & 0 & 1 & 2 & 3\\\\
        1 & 1 & 1 & 2 & 3\\\\
        2 & 2 & 2 & 2 & 3\\\\
        3 & 3 & 3 & 3 & 3
        \end{array}
    \end{array}
    % 内层第一行表格组结束
    \\\\
    % inner array of delta values 内层第二行Delta值数组
        \begin{array}{c|cccc}
        \Delta&0&1&2&3\\\\
        \hline
        0 & 0 & 1 & 2 & 3\\\\
        1 & 1 & 0 & 1 & 2\\\\
        2 & 2 & 1 & 0 & 1\\\\
        3 & 3 & 2 & 1 & 0
        \end{array}
        % 内层第二行表格组结束
\end{array}
  • 显示:
    $$
    % outer vertical array of arrays 外层垂直表格
    \begin{array}{c}
    % inner horizontal array of arrays 内层水平表格
    \begin{array}{cc}
      % inner array of minimum values 内层"最小值"数组
      \begin{array}{c|cccc}
      \text{min} & 0 & 1 & 2 & 3\\\\
      \hline
      0 & 0 & 0 & 0 & 0\\\\
      1 & 0 & 1 & 1 & 1\\\\
      2 & 0 & 1 & 2 & 2\\\\
      3 & 0 & 1 & 2 & 3
      \end{array}
    &
      % inner array of maximum values 内层"最大值"数组
      \begin{array}{c|cccc}
      \text{max}&0&1&2&3\\\\
      \hline
      0 & 0 & 1 & 2 & 3\\\\
      1 & 1 & 1 & 2 & 3\\\\
      2 & 2 & 2 & 2 & 3\\\\
      3 & 3 & 3 & 3 & 3
      \end{array}
    \end{array}
    % 内层第一行表格组结束
    \\
    % inner array of delta values 内层第二行Delta值数组
      \begin{array}{c|cccc}
      \Delta&0&1&2&3\\\\
      \hline
      0 & 0 & 1 & 2 & 3\\\\
      1 & 1 & 0 & 1 & 2\\\\
      2 & 2 & 1 & 0 & 1\\\\
      3 & 3 & 2 & 1 & 0
      \end{array}
      % 内层第二行表格组结束
    \end{array}
    $$

用数组实现带分割符号的矩阵

  • 例子:
$$
\left[
    \begin{array}{cc|c}
      1&2&3\\\\
      4&5&6
    \end{array}
\right]
$$
  • 显示:
    $$
    \left[
    \begin{array}{cc|c}
    1&2&3\\\\
    4&5&6
    \end{array}
    \right]
    $$

其中 cc|c 代表在一个三列矩阵中的第二和第三列之间插入分割线。

字体

希腊字母

输入 \小写希腊字母英文全称\首字母大写希腊字母英文全称 来分别输入小写和大写希腊字母。

\Alpha \Beta \Gamma \Delta \Epsilon \Zeta \Eta \Theta

{\displaystyle \mathrm {A} \mathrm {B} \Gamma \Delta \mathrm {E} \mathrm {Z} \mathrm {H} \Theta }

\Iota \Kappa \Lambda \Mu \Nu \Xi \Omicron \Pi

{\displaystyle \mathrm {I} \mathrm {K} \Lambda \mathrm {M} \mathrm {N} \mathrm {O} \Xi \Pi }

\Rho \Sigma \Tau \Upsilon \Phi \Chi \Psi \Omega

{\displaystyle \mathrm {P} \Sigma \mathrm {T} \Upsilon \Phi \mathrm {X} \Psi \Omega }

\alpha \beta \gamma \delta \epsilon \zeta \eta \theta

{\displaystyle \alpha \beta \gamma \delta \epsilon \zeta \eta \theta}

\iota \kappa \lambda \mu \nu \omicron \xi \pi

{\displaystyle \iota \kappa \lambda \mu \nu \mathrm {o} \xi \pi }

\rho \sigma \tau \upsilon \phi \chi \psi \omega

{\displaystyle \rho \sigma \tau \upsilon \phi \chi \psi \omega}

部分字母有变量专用形式,以 \var- 开头。

\varepsilon \digamma \varkappa \varpi

{\displaystyle \varepsilon \digamma \varkappa \varpi}

\varrho \varsigma \vartheta \varphi

{\displaystyle \varrho \varsigma \vartheta \varphi}

希伯来符号

\aleph \beth \gimel \daleth

{\displaystyle \aleph \beth \gimel \daleth}

部分字体的简称

若要对公式的某一部分字符进行字体转换,可以用 {\字体 {需转换的部分字符}} 命令,其中 \字体 部分可以参照下表选择合适的字体。一般情况下,公式默认为意大利体 $italic$ 。

| 输入 | 说明 | 显示 | 输入 | 说明 | 显示 |
| :—: | :—: | :—: | :—: | :—: | :—: ||
| \rm | 罗马体 | $\rm{Sample}$$ | \cal | 花体 | $\cal{SAMPLE}$$ |
| \it | 意大利体 | $\it{Sample}$$ | \Bbb | 黑板粗体 | $\Bbb{SAMPLE}$$ |
| \bf | 粗体 | $\bf{Sample}$$ | \mit | 数学斜体 | $\mit{SAMPLE}$$ |
| \sf | 等线体 | $\sf{Sample}$$ | \scr | 手写体 | $\scr{SAMPLE}$$ |
| \tt | 打字机体 | $\tt{Sample}$$ | \frak | 旧德式字体 | $\frak{Sample}$$ |

所有字体

黑板报粗体

\mathbb{ABCDEFGHI}

{\displaystyle \mathbb {ABCDEFGHI} }

\mathbb{JKLMNOPQR}

{\displaystyle \mathbb {JKLMNOPQR} }

\mathbb{STUVWXYZ}

{\displaystyle \mathbb {STUVWXYZ} }

粗体

\mathbf{ABCDEFGHI}

{\displaystyle \mathbf {ABCDEFGHI} }

\mathbf{JKLMNOPQR}

{\displaystyle \mathbf {JKLMNOPQR} }

\mathbf{STUVWXYZ}

{\displaystyle \mathbf {STUVWXYZ} }

\mathbf{abcdefghijklm}

{\displaystyle \mathbf {abcdefghijklm} }

\mathbf{nopqrstuvwxyz}

{\displaystyle \mathbf {nopqrstuvwxyz} }

\mathbf{0123456789}

{\displaystyle \mathbf {0123456789} }

粗体希腊字母

\boldsymbol{\Alpha\Beta\Gamma\Delta\Epsilon\Zeta\Eta\Theta}

{\displaystyle {\boldsymbol {\mathrm {A} \mathrm {B} \Gamma \Delta \mathrm {E} \mathrm {Z} \mathrm {H} \Theta }}}

\boldsymbol{\Iota\Kappa\Lambda\Mu\Nu\Xi\Pi\Rho}

{\displaystyle {\boldsymbol {\mathrm {I} \mathrm {K} \Lambda \mathrm {M} \mathrm {N} \Xi \Pi \mathrm {P} }}}

\boldsymbol{\Sigma\Tau\Upsilon\Phi\Chi\Psi\Omega}

{\displaystyle {\boldsymbol {\Sigma \mathrm {T} \Upsilon \Phi \mathrm {X} \Psi \Omega }}}

\boldsymbol{\alpha\beta\gamma\delta\epsilon\zeta\eta\theta}

{\displaystyle {\boldsymbol {\alpha \beta \gamma \delta \epsilon \zeta \eta \theta}}}

\boldsymbol{\iota\kappa\lambda\mu\nu\xi\pi\rho}

{\displaystyle {\boldsymbol {\iota \kappa \lambda \mu \nu \xi \pi \rho}}}

\boldsymbol{\sigma\tau\upsilon\phi\chi\psi\omega}

{\displaystyle {\boldsymbol {\sigma \tau \upsilon \phi \chi \psi \omega}}}

\boldsymbol{\varepsilon\digamma\varkappa\varpi}

{\displaystyle {\boldsymbol {\varepsilon \digamma \varkappa \varpi}}}

\boldsymbol{\varrho\varsigma\vartheta\varphi}

{\displaystyle {\boldsymbol {\varrho \varsigma \vartheta \varphi}}}

斜体(拉丁字母默认)

\mathit{0123456789}

{\displaystyle {\mathit {0123456789}}}

斜体希腊字母(小写字母默认)

\mathit{\Alpha\Beta\Gamma\Delta\Epsilon\Zeta\Eta\Theta}

{\displaystyle {\mathit {\mathrm {A} \mathrm {B} \Gamma \Delta \mathrm {E} \mathrm {Z} \mathrm {H} \Theta }}}

\mathit{\Iota\Kappa\Lambda\Mu\Nu\Xi\Pi\Rho}

{\displaystyle {\mathit {\mathrm {I} \mathrm {K} \Lambda \mathrm {M} \mathrm {N} \Xi \Pi \mathrm {P} }}}

\mathit{\Sigma\Tau\Upsilon\Phi\Chi\Psi\Omega}

{\displaystyle {\mathit {\Sigma \mathrm {T} \Upsilon \Phi \mathrm {X} \Psi \Omega }}}

罗马体

\mathrm{ABCDEFGHI}

{\displaystyle \mathrm {ABCDEFGHI} }

\mathrm{JKLMNOPQR}

{\displaystyle \mathrm {JKLMNOPQR} }

\mathrm{STUVWXYZ}

{\displaystyle \mathrm {STUVWXYZ} }

\mathrm{abcdefghijklm}

{\displaystyle \mathrm {abcdefghijklm} }

\mathrm{nopqrstuvwxyz}

{\displaystyle \mathrm {nopqrstuvwxyz} }

\mathrm{0123456789}

{\displaystyle \mathrm {0123456789} }

无衬线体

\mathsf{ABCDEFGHI}

{\displaystyle {\mathsf {ABCDEFGHI}}}

\mathsf{JKLMNOPQR}

{\displaystyle {\mathsf {JKLMNOPQR}}}

\mathsf{STUVWXYZ}

{\displaystyle {\mathsf {STUVWXYZ}}}

\mathsf{abcdefghijklm}

{\displaystyle {\mathsf {abcdefghijklm}}}

\mathsf{nopqrstuvwxyz}

{\displaystyle {\mathsf {nopqrstuvwxyz}}}

\mathsf{0123456789}

{\displaystyle {\mathsf {0123456789}}}

无衬线体希腊字母(仅大写)

\mathsf{\Alpha \Beta \Gamma \Delta \Epsilon \Zeta \Eta \Theta}

{\displaystyle {\mathsf {\mathrm {A} \mathrm {B} \Gamma \Delta \mathrm {E} \mathrm {Z} \mathrm {H} \Theta }}}

\mathsf{\Iota \Kappa \Lambda \Mu \Nu \Xi \Pi \Rho}

{\displaystyle {\mathsf {\mathrm {I} \mathrm {K} \Lambda \mathrm {M} \mathrm {N} \Xi \Pi \mathrm {P} }}}

\mathsf{\Sigma \Tau \Upsilon \Phi \Chi \Psi \Omega}

{\displaystyle {\mathsf {\Sigma \mathrm {T} \Upsilon \Phi \mathrm {X} \Psi \Omega }}}

手写体 / 花体

\mathcal{ABCDEFGHI}

{\displaystyle {\mathcal {ABCDEFGHI}}}

\mathcal{JKLMNOPQR}

{\displaystyle {\mathcal {JKLMNOPQR}}}

\mathcal{STUVWXYZ}

{\displaystyle {\mathcal {STUVWXYZ}}}

Fraktur 体

\mathfrak{ABCDEFGHI}

{\displaystyle {\mathfrak {ABCDEFGHI}}}

\mathfrak{JKLMNOPQR}

{\displaystyle {\mathfrak {JKLMNOPQR}}}

\mathfrak{STUVWXYZ}

{\displaystyle {\mathfrak {STUVWXYZ}}}

\mathfrak{abcdefghijklm}

{\displaystyle {\mathfrak {abcdefghijklm}}}

\mathfrak{nopqrstuvwxyz}

{\displaystyle {\mathfrak {nopqrstuvwxyz}}}

\mathfrak{0123456789}

{\displaystyle {\mathfrak {0123456789}}}

小型手写体

{\scriptstyle\text{abcdefghijklm}}

{\displaystyle {\scriptstyle {\text{abcdefghijklm}}}}

混合字体

特征|语法|渲染效果

斜体字符(忽略空格)

x y z

{\displaystyle xyz}

非斜体字符

\text{x y z}

{\displaystyle {\text{x y z}}}

混合斜体(差)

\text{if} n \text{is even}

{\displaystyle {\text{if}}n{\text{is even}}}

混合斜体(好)

\text{if }n\text{ is even}

{\displaystyle {\text{if }}n{\text{ is even}}}

混合斜体(替代品:~ 或者 \ 强制空格)

\text{if}~n\ \text{is even}

{\displaystyle {\text{if}}~n\ {\text{is even}}}

注释文本

使用 \text {文字} 来添加注释文本(注释文本不会被识别为公式,不用斜体显示)。\text {文字}中仍可以使用 $公式$ 插入其它公式。

  • 例子:

    f(n)= \begin{cases}
    n/2, & \text {if $n$ is even} \\\\
    3n+1, &\text{if $n$ is odd}
    \end{cases} 
  • 显示:


f(n)= \begin{cases} n/2, & \text {if}\ n\ \text{is even} \\ 3n+1, & \text {if}\ n\ \text{is odd} \end{cases}

括号

()[]| 表示符号本身,使用 \{\} 来表示 {}

功能|语法|显示

短括号

\frac{1}{2}

{\displaystyle ({\frac {1}{2}})}

长括号

\left(\frac{1}{2} \right

{\displaystyle \left({\frac {1}{2}}\right)}

使用 \left\right 来创建自动匹配高度的 (圆括号),[方括号] 和 {花括号} 。

功能|语法|显示

圆括号,小括号

\left( \frac{a}{b} \right)

{\displaystyle \left({\frac {a}{b}}\right)}

方括号,中括号

\left[ \frac{a}{b} \right]

{\displaystyle \left[{\frac {a}{b}}\right]}

花括号,大括号

\left{ \frac{a}{b} \right}

{\displaystyle \left\{\frac {a}{b}\right\}}

角括号

\left \langle \frac{a}{b} \right \rangle

{\displaystyle \left\langle {\frac {a}{b}}\right\rangle }

单竖线,绝对值

\left| \frac{a}{b} \right|

{\displaystyle \left| \frac{a}{b} \right|}

双竖线,范

\left \| \frac{a}{b} \right \|

{\displaystyle \left|{\frac {a}{b}}\right|}

取整函数

\left \lfloor \frac{a}{b} \right \rfloor

{\displaystyle \left\lfloor {\frac {a}{b}}\right\rfloor }

取顶函数

\left \lceil \frac{c}{d} \right \rceil

{\displaystyle \left\lceil {\frac {c}{d}}\right\rceil }

斜线与反斜线

\left / \frac{a}{b} \right \backslash

{\displaystyle \left/{\frac {a}{b}}\right\backslash }

上下箭头

\left \uparrow \frac{a}{b} \right \downarrow

{\displaystyle \left\uparrow {\frac {a}{b}}\right\downarrow }

\left \Uparrow \frac{a}{b} \right \Downarrow

{\displaystyle \left\Uparrow {\frac {a}{b}}\right\Downarrow }

\left \updownarrow \frac{a}{b} \right \Updownarrow

{\displaystyle \left\updownarrow {\frac {a}{b}}\right\Updownarrow }

混合括号

\left[ 0,1 \right)

{\displaystyle \left[0,1\right)}

\left \langle \psi \right |

$\left \langle \psi \right |$

如果括号只有一边,要用 \left.\right. 匹配另一边。

单左括号

\left \{\frac{a}{b} \right.

{\displaystyle \left{{\frac {a}{b}}\right.}

单右括号

\left. \frac{a}{b} \right \}

{\displaystyle \left.{\frac {a}{b}}\right\}}

备注:

  • 可以使用 \big, \Big, \bigg, \Bigg 控制括号的大小,比如代码

    \Bigg ( \bigg [ \Big \{ \big \langle \left | \| \frac{a}{b} \| \right | \big \rangle \Big \} \bigg ] \Bigg )

    显示︰
    $\Big(\Big)$


    \Bigg ( \bigg [ \Big \{ \big \langle \left | \| \frac{a}{b} \| \right | \big \rangle \Big \} \bigg ] \Bigg )

空格

注意 TeX 能够自动处理大多数的空格,但是您有时候需要自己来控制。

功能|语法|显示|宽度

2 个 quad 空格

\alpha\qquad\beta

{\displaystyle \alpha \qquad \beta}

{\displaystyle mm}

quad 空格

\alpha\quad\beta

{\displaystyle \alpha \quad \beta}

{\displaystyle m}

大空格

\alpha\ \beta

{\displaystyle \alpha \ \beta}

{\displaystyle {\frac{m}{3}}}

中等空格

\alpha\;\beta

{\displaystyle \alpha ;\beta}

{\displaystyle {\frac {2m}{7}}}

小空格

\alpha\,\beta

{\displaystyle \alpha ,\beta}

{\displaystyle {\frac {m}{6}}}

没有空格

\alpha\beta

{\displaystyle \alpha \beta }

{\displaystyle 0}

紧贴

\alpha\!\beta

{\displaystyle \alpha !\beta}

{\displaystyle -{\frac {m}{6}}}

颜色

Cmd Markdown 公式指导手册里是这样写的:

使用 \color{颜色}{文字} 来更改特定的文字颜色。
更改文字颜色 需要浏览器支持 ,如果浏览器不知道你所需的颜色,那么文字将被渲染为黑色。

对于较旧的浏览器(HTML4与CSS2),以下颜色是被支持的:

输入 显示 输入 显示
black $\color{black}{text}$$ grey $\color{grey}{text}$$
silver $\color{silver}{text}$$ white $\color{white}{text}$$
maroon $\color{maroon}{text}$$ red $\color{red}{text}$$
yellow $\color{yellow}{text}$$ lime $\color{lime}{text}$$
olive $\color{olive}{text}$$ green $\color{green}{text}$$
teal $\color{teal}{text}$$ auqa $\color{auqa}{text}$$
blue $\color{blue}{text}$$ navy $\color{navy}{text}$$
purple $\color{purple}{text}$$ fuchsia $\color{fuchsia}{text}$$

对于较新的浏览器(HTML5与CSS3),额外的124种颜色将被支持:

输入 \color {#rgb} {text} 来自定义更多的颜色,其中 #rgbr g b 可输入 0-9a-f 来表示红色、绿色和蓝色的纯度(饱和度)。

  • 例子:
\begin{array}{|rrrrrrrr|}\hline
\verb+#000+ & \color{#000}{text} & & &
\verb+#00F+ & \color{#00F}{text} & & \\\\
& & \verb+#0F0+ & \color{#0F0}{text} &
& & \verb+#0FF+ & \color{#0FF}{text}\\\\
\verb+#F00+ & \color{#F00}{text} & & &
\verb+#F0F+ & \color{#F0F}{text} & & \\\\
& & \verb+#FF0+ & \color{#FF0}{text} &
& & \verb+#FFF+ & \color{#FFF}{text}\\\\
\hline
\end{array}
  • 显示:

    \begin{array}{|rrrrrrrr|}\hline
    \verb+#000+ & \color{#000}{text} & & &
    \verb+#00F+ & \color{#00F}{text} & & \\
    & & \verb+#0F0+ & \color{#0F0}{text} &
    & & \verb+#0FF+ & \color{#0FF}{text}\\
    \verb+#F00+ & \color{#F00}{text} & & &
    \verb+#F0F+ & \color{#F0F}{text} & & \\
    & & \verb+#FF0+ & \color{#FF0}{text} &
    & & \verb+#FFF+ & \color{#FFF}{text}\\
    \hline
    \end{array}

  • 例子:

    \begin{array}{|rrrrrrrr|}
    \hline
    \verb+#000+ & \color{#000}{text} & \verb+#005+ & \color{#005}{text} & \verb+#00A+ & \color{#00A}{text} & \verb+#00F+ & \color{#00F}{text}  \\\\
    \verb+#500+ & \color{#500}{text} & \verb+#505+ & \color{#505}{text} & \verb+#50A+ & \color{#50A}{text} & \verb+#50F+ & \color{#50F}{text}  \\\\
    \verb+#A00+ & \color{#A00}{text} & \verb+#A05+ & \color{#A05}{text} & \verb+#A0A+ & \color{#A0A}{text} & \verb+#A0F+ & \color{#A0F}{text}  \\\\
    \verb+#F00+ & \color{#F00}{text} & \verb+#F05+ & \color{#F05}{text} & \verb+#F0A+ & \color{#F0A}{text} & \verb+#F0F+ & \color{#F0F}{text}  \\\\
    \hline
    \verb+#080+ & \color{#080}{text} & \verb+#085+ & \color{#085}{text} & \verb+#08A+ & \color{#08A}{text} & \verb+#08F+ & \color{#08F}{text}  \\\\
    \verb+#580+ & \color{#580}{text} & \verb+#585+ & \color{#585}{text} & \verb+#58A+ & \color{#58A}{text} & \verb+#58F+ & \color{#58F}{text}  \\\\
    \verb+#A80+ & \color{#A80}{text} & \verb+#A85+ & \color{#A85}{text} & \verb+#A8A+ & \color{#A8A}{text} & \verb+#A8F+ & \color{#A8F}{text}  \\\\
    \verb+#F80+ & \color{#F80}{text} & \verb+#F85+ & \color{#F85}{text} & \verb+#F8A+ & \color{#F8A}{text} & \verb+#F8F+ & \color{#F8F}{text}  \\\\
    \hline
    \verb+#0F0+ & \color{#0F0}{text} & \verb+#0F5+ & \color{#0F5}{text} & \verb+#0FA+ & \color{#0FA}{text} & \verb+#0FF+ & \color{#0FF}{text}  \\\\
    \verb+#5F0+ & \color{#5F0}{text} & \verb+#5F5+ & \color{#5F5}{text} & \verb+#5FA+ & \color{#5FA}{text} & \verb+#5FF+ & \color{#5FF}{text}  \\\\
    \verb+#AF0+ & \color{#AF0}{text} & \verb+#AF5+ & \color{#AF5}{text} & \verb+#AFA+ & \color{#AFA}{text} & \verb+#AFF+ & \color{#AFF}{text}  \\\\
    \verb+#FF0+ & \color{#FF0}{text} & \verb+#FF5+ & \color{#FF5}{text} & \verb+#FFA+ & \color{#FFA}{text} & \verb+#FFF+ & \color{#FFF}{text}  \\\\
    \hline
    \end{array}
  • 显示:

    \begin{array}{|rrrrrrrr|}
    \hline
    \verb+#000+ & \color{#000}{text} & \verb+#005+ & \color{#005}{text} & \verb+#00A+ & \color{#00A}{text} & \verb+#00F+ & \color{#00F}{text} \\
    \verb+#500+ & \color{#500}{text} & \verb+#505+ & \color{#505}{text} & \verb+#50A+ & \color{#50A}{text} & \verb+#50F+ & \color{#50F}{text} \\
    \verb+#A00+ & \color{#A00}{text} & \verb+#A05+ & \color{#A05}{text} & \verb+#A0A+ & \color{#A0A}{text} & \verb+#A0F+ & \color{#A0F}{text} \\
    \verb+#F00+ & \color{#F00}{text} & \verb+#F05+ & \color{#F05}{text} & \verb+#F0A+ & \color{#F0A}{text} & \verb+#F0F+ & \color{#F0F}{text} \\
    \hline
    \verb+#080+ & \color{#080}{text} & \verb+#085+ & \color{#085}{text} & \verb+#08A+ & \color{#08A}{text} & \verb+#08F+ & \color{#08F}{text} \\
    \verb+#580+ & \color{#580}{text} & \verb+#585+ & \color{#585}{text} & \verb+#58A+ & \color{#58A}{text} & \verb+#58F+ & \color{#58F}{text} \\
    \verb+#A80+ & \color{#A80}{text} & \verb+#A85+ & \color{#A85}{text} & \verb+#A8A+ & \color{#A8A}{text} & \verb+#A8F+ & \color{#A8F}{text} \\
    \verb+#F80+ & \color{#F80}{text} & \verb+#F85+ & \color{#F85}{text} & \verb+#F8A+ & \color{#F8A}{text} & \verb+#F8F+ & \color{#F8F}{text} \\
    \hline
    \verb+#0F0+ & \color{#0F0}{text} & \verb+#0F5+ & \color{#0F5}{text} & \verb+#0FA+ & \color{#0FA}{text} & \verb+#0FF+ & \color{#0FF}{text} \\
    \verb+#5F0+ & \color{#5F0}{text} & \verb+#5F5+ & \color{#5F5}{text} & \verb+#5FA+ & \color{#5FA}{text} & \verb+#5FF+ & \color{#5FF}{text} \\
    \verb+#AF0+ & \color{#AF0}{text} & \verb+#AF5+ & \color{#AF5}{text} & \verb+#AFA+ & \color{#AFA}{text} & \verb+#AFF+ & \color{#AFF}{text} \\
    \verb+#FF0+ & \color{#FF0}{text} & \verb+#FF5+ & \color{#FF5}{text} & \verb+#FFA+ & \color{#FFA}{text} & \verb+#FFF+ & \color{#FFF}{text} \\
    \hline
    \end{array}

维基百科的数学公式教程里是这样写的:

语法:{\color{颜色}表达式}

作者实测:在部分浏览器中,上面的语法可能是错误的(只将表达式的第一个字符着色),\color{颜色}{文字}的语法才是正确的。例如:

{\color{Red}abc}显示{\color{Red}abc}
\color{Red}{abc}显示$\color{Red}{abc}$$

支持色调表:

{\displaystyle \color {Apricot}{\text{Apricot}}}

{\displaystyle \color {Aquamarine}{\text{Aquamarine}}}

{\displaystyle \color {Bittersweet}{\text{Bittersweet}}}

{\displaystyle \color {Black}{\text{Black}}}

{\displaystyle \color {Blue}{\text{Blue}}}

{\displaystyle \color {BlueGreen}{\text{BlueGreen}}}

{\displaystyle \color {BlueViolet}{\text{BlueViolet}}}

{\displaystyle \color {BrickRed}{\text{BrickRed}}}

{\displaystyle \color {Brown}{\text{Brown}}}

{\displaystyle \color {BurntOrange}{\text{BurntOrange}}}

{\displaystyle \color {CadetBlue}{\text{CadetBlue}}}

{\displaystyle \color {CarnationPink}{\text{CarnationPink}}}

{\displaystyle \color {Cerulean}{\text{Cerulean}}}

{\displaystyle \color {CornflowerBlue}{\text{CornflowerBlue}}}

{\displaystyle \color {Cyan}{\text{Cyan}}}

{\displaystyle \color {Dandelion}{\text{Dandelion}}}

{\displaystyle \color {DarkOrchid}{\text{DarkOrchid}}}

{\displaystyle \color {Emerald}{\text{Emerald}}}

{\displaystyle \color {ForestGreen}{\text{ForestGreen}}}

{\displaystyle \color {Fuchsia}{\text{Fuchsia}}}

{\displaystyle \color {Goldenrod}{\text{Goldenrod}}}

{\displaystyle \color {Gray}{\text{Gray}}}

{\displaystyle \color {Green}{\text{Green}}}

{\displaystyle \color {GreenYellow}{\text{GreenYellow}}}

{\displaystyle \color {JungleGreen}{\text{JungleGreen}}}

{\displaystyle \color {Lavender}{\text{Lavender}}}

{\displaystyle \color {LimeGreen}{\text{LimeGreen}}}

{\displaystyle \color {Magenta}{\text{Magenta}}}

{\displaystyle \color {Mahogany}{\text{Mahogany}}}

{\displaystyle \color {Maroon}{\text{Maroon}}}

{\displaystyle \color {Melon}{\text{Melon}}}

{\displaystyle \color {MidnightBlue}{\text{MidnightBlue}}}

{\displaystyle \color {Mulberry}{\text{Mulberry}}}

{\displaystyle \color {NavyBlue}{\text{NavyBlue}}}

{\displaystyle \color {OliveGreen}{\text{OliveGreen}}}

{\displaystyle \color {Orange}{\text{Orange}}}

{\displaystyle \color {OrangeRed}{\text{OrangeRed}}}

{\displaystyle \color {Orchid}{\text{Orchid}}}

{\displaystyle \color {Peach}{\text{Peach}}}

{\displaystyle \color {Periwinkle}{\text{Periwinkle}}}

{\displaystyle \color {PineGreen}{\text{PineGreen}}}

{\displaystyle \color {Plum}{\text{Plum}}}

{\displaystyle \color {ProcessBlue}{\text{ProcessBlue}}}

{\displaystyle \color {Purple}{\text{Purple}}}

{\displaystyle \color {RawSienna}{\text{RawSienna}}}

{\displaystyle \color {Red}{\text{Red}}}

{\displaystyle \color {RedOrange}{\text{RedOrange}}}

{\displaystyle \color {RedViolet}{\text{RedViolet}}}

{\displaystyle \color {Rhodamine}{\text{Rhodamine}}}

{\displaystyle \color {RoyalBlue}{\text{RoyalBlue}}}

{\displaystyle \color {RoyalPurple}{\text{RoyalPurple}}}

{\displaystyle \color {RubineRed}{\text{RubineRed}}}

{\displaystyle \color {Salmon}{\text{Salmon}}}

{\displaystyle \color {SeaGreen}{\text{SeaGreen}}}

{\displaystyle \color {Sepia}{\text{Sepia}}}

{\displaystyle \color {SkyBlue}{\text{SkyBlue}}}

{\displaystyle \color {SpringGreen}{\text{SpringGreen}}}

{\displaystyle \color {Tan}{\text{Tan}}}

{\displaystyle \color {TealBlue}{\text{TealBlue}}}

{\displaystyle \color {Thistle}{\text{Thistle}}}

{\displaystyle \color {Turquoise}{\text{Turquoise}}}

{\displaystyle \color {Violet}{\text{Violet}}}

{\displaystyle \color {VioletRed}{\text{VioletRed}}}

{\displaystyle \color {White}{\text{White}}}

{\displaystyle \color {WildStrawberry}{\text{WildStrawberry}}}

{\displaystyle \color {Yellow}{\text{Yellow}}}

{\displaystyle \color {YellowGreen}{\text{YellowGreen}}}

{\displaystyle \color {YellowOrange}{\text{YellowOrange}}}

*注︰输入时第一个字母必需以大写输入,如\color{OliveGreen}

例子

  • {\color{Blue}x^2}+{\color{Brown}2x} - {\color{OliveGreen}1}

    {\displaystyle {\color {Blue}x^{2}}+{\color {Brown}2x}-{\color {OliveGreen}1}}

  • x_{\color{Maroon}1,2}=\frac{-b\pm\sqrt{{\color{Maroon}b^2-4ac}}}{2a}

    {\displaystyle x_{\color {Maroon}1,2}={\frac {-b\pm {\sqrt {\color {Maroon}b^{2}-4ac}}}{2a}}}

外部链接

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