LaTeX 数学公式指南（KaTeX 版）

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LaTeX数学公式指南（KaTeX版）

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TeXLaTeXKaTeX\TeX \quad \LaTeX \quad \KaTeX

声调 / 变音 / 上下标 / 上下括号 / 向量

a′a' a'a~\tilde{a} \tilde{a}g˚\mathring{g} \mathring{g}
a′′a'' a''ac~\widetilde{ac}\widetilde{ac}AB⏠\overgroup{AB}\overgroup{AB}
a′a^{\prime} a^{\prime}AB~\utilde{AB} \utilde{AB}AB⏡\undergroup{AB} \undergroup{AB}
aˊ\acute{a} \acute{a}F⃗\vec{F}\vec{F}AB⇒\Overrightarrow{AB}\Overrightarrow{AB}
yˉ\bar{y} \bar{y}AB←\overleftarrow{AB}\overleftarrow{AB}AB→\overrightarrow{AB}\overrightarrow{AB}
a˘\breve{a} \breve{a}AB←\underleftarrow{AB} \underleftarrow{AB}AB→\underrightarrow{AB} \underrightarrow{AB}
aˇ\check{a} \check{a}ac↼\overleftharpoon{ac}\overleftharpoon{ac}ac⇀\overrightharpoon{ac}\overrightharpoon{ac}
a˙\dot{a} \dot{a}AB↔\overleftrightarrow{AB}\overleftrightarrow{AB}AB⏞\overbrace{AB}\overbrace{AB}
a¨\ddot{a} \ddot{a}AB↔\underleftrightarrow{AB} \underleftrightarrow{AB}AB⏟\underbrace{AB} \underbrace{AB}
aˋ\grave{a} \grave{a}AB‾\overline{AB} \overline{AB}ABundefined\overlinesegment{AB}\overlinesegment{AB}
θ^\hat{\theta} \hat{\theta}AB‾\underline{AB} \underline{AB}ABundefined\underlinesegment{AB} \underlinesegment{AB}
ac^\widehat{ac}\widehat{ac}acˇ\widecheck{ac}\widecheck{ac}\underbar{X} \underbar{X}

在 \text{...} 中的声调 / 变音符号

aˊ\text{\'{a}} \'{a}a˜\text{\~{a}} \~{a}a˙\text{\.{a}} \.{a}a˝\text{\H{a}} \H{a}
a˚\text{\r{a}} \r{a}aˉ\text{\={a}} \={a}a¨\text{\"{a}} \"{a}aˇ\text{\v{a}} \v{a}
aˆ\text{\^{a}} \^{a}a˘\text{\u{a}} \u{a}

分隔符 / 括号 / 箭头

()( ) ( )()\lparen \rparen \lparen \rparen⌈⌉⌈ ⌉ ⌈ ⌉⌈⌉\lceil \rceil \lceil \rceil↑\uparrow \uparrow
[][ ] [ ][]\lbrack \rbrack \lbrack \rbrack⌊⌋⌊⌋ ⌊ ⌋⌊⌋\lfloor \rfloor \lfloor \rfloor↓\downarrow \downarrow
{}\{ \} \{ \}{}\lbrace \rbrace \lbrace \rbrace⎰⎱⎰⎱ ⎰⎱⎰⎱\lmoustache \rmoustache \lmoustache \rmoustache↕\updownarrow \updownarrow
⟨⟩⟨ ⟩ ⟨ ⟩⟨⟩\langle \rangle \langle \rangle⟮⟯⟮ ⟯ ⟮ ⟯⟮⟯\lgroup \rgroup \lgroup \rgroup⇑\Uparrow \Uparrow
|$$∣\vert \vert┌┐┌ ┐ ┌ ┐┌┐\ulcorner \urcorner \ulcorner \urcorner
\|∥\|∥\Vert \Vert└┘└ ┘ └ ┘└┘\llcorner \lrcorner \llcorner \lrcorner⇕\Updownarrow \Updownarrow
∣∣\lvert \rvert \lvert \rvert∥∥\lVert \rVert \lVert \rVert$$ ``\left. \right. \left. \right.（相信眼睛）\\backslash \backslash
⟨⟩\lang \rang \lang \rang<>\lt \gt \lt \gt⟦⟧⟦ ⟧ ⟦ ⟧⟦⟧\llbracket \rrbracket``\llbracket \rrbracket⦃⦄\lBrace \rBrace \lBrace \rBrace

分隔符大小

(AB)\left(\LARGE{AB}\right) \left(\LARGE{AB}\right)

(((((( \big( \Big( \bigg( \Bigg( ( \big( \Big( \bigg( \Bigg(

\left\big\bigl\bigm\bigr
\middle\Big\Bigl\Bigm\Bigr
\right\bigg\biggl\biggm\biggr
\Bigg\Biggl\Biggm\Biggr

环境 / 形式

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\begin{matrix}
 a & b \\
 c & d
\end{matrix}
or
\begin{array}{cc}
 a & b \\
 c & d
\end{array}

abcd\begin{matrix} a & b \\ c & d \end{matrix}

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\begin{pmatrix}
 a & b \\
 c & d
\end{pmatrix}

(abcd)\begin{pmatrix} a & b \\ c & d \end{pmatrix}

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\begin{bmatrix}
 a & b \\
 c & d
\end{bmatrix}

[abcd]\begin{bmatrix} a & b \\ c & d \end{bmatrix}

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\begin{vmatrix}
 a & b \\
 c & d
\end{vmatrix}

∣abcd∣\begin{vmatrix} a & b \\ c & d \end{vmatrix}

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\begin{Vmatrix}
 a & b \\
 c & d
\end{Vmatrix}

∥abcd∥\begin{Vmatrix} a & b \\ c & d \end{Vmatrix}

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\begin{Bmatrix}
 a & b \\
 c & d
\end{Bmatrix}

{abcd}\begin{Bmatrix} a & b \\ c & d \end{Bmatrix}

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\def\arraystretch{1.5}
 \begin{array}{c:c:c}
  a & b & c \\ \hline
  d & e & f \\
  \hdashline
  g & h & i
 \end{array}

abcdefghi\def\arraystretch{1.5} \begin{array}{c:c:c} a & b & c \\ \hline d & e & f \\ \hdashline g & h & i \end{array}

此处显示有误

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x =
\begin{cases}
 a &\text{if } b \\
 c &\text{if } d
\end{cases}

x={aif bcif dx = \begin{cases} a &\text{if } b \\ c &\text{if } d \end{cases}

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\begin{rcases}
 a &\text{if } b \\
 c &\text{if } d
\end{rcases}

Error to display.(Will be fixed soon.)\text{Error to display.(Will be fixed soon.)}

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\begin{smallmatrix}
 a & b \\
 c & d
\end{smallmatrix}

Error to display.(Will be fixed soon.)\text{Error to display.(Will be fixed soon.)}

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\sum_{
\begin{subarray}{l}
 i\in\Lambda\\
 0<j<n
\end{subarray}
}

Error to display.(Will be fixed soon.)\text{Error to display.(Will be fixed soon.)}

HTML

KaTeX\href{https://katex.org/}{\KaTeX}\href{https://katex.org/}{\KaTeX}
https://katex.org/\url{https://katex.org/}\url{https://katex.org/}

字母与 Unicode

希腊字母

A\Alpha \AlphaB\Beta \BetaΓ\Gamma \GammaΔ\Delta \DeltaE\Epsilon \EpsilonZ\Zeta \Zeta
H\Eta \EtaΘ\Theta \ThetaI\Iota \IotaK\Kappa \KappaΛ\Lambda \LambdaM\Mu \Mu
N\Nu \NuΞ\Xi \XiO\Omicron \OmicronΠ\Pi \PiP\Rho \RhoΣ\Sigma \Sigma
T\Tau \TauΥ\Upsilon \UpsilonΦ\Phi \PhiX\Chi \ChiΨ\Psi \PsiΩ\Omega \Omega
Γ\varGamma \varGammaΔ\varDelta \varDeltaΘ\varTheta \varThetaΛ\varLambda \varLambdaΞ\varXi \varXiΠ\varPi \varPi
Σ\varSigma \varSigmaΥ\varUpsilon \varUpsilonΦ\varPhi \varPhiΨ\varPsi \varPsiΩ\varOmega \varOmega
α\alpha \alphaβ\beta \betaγ\gamma \gammaδ\delta \deltaϵ\epsilon \epsilonζ\zeta \zeta
η\eta \etaθ\theta \thetaι\iota \iotaκ\kappa \kappaλ\lambda \lambdaμ\mu \mu
ν\nu \nuξ\xi \xiο\omicron \omicronπ\pi \piρ\rho \rhoρ\rho \rho
σ\sigma \sigmaτ\tau \tauυ\upsilon \upsilonϕ\phi \phiχ\chi \chiψ\psi \psi
ω\omega \omegaε\varepsilon \varepsilonϰ\varkappa \varkappaϑ\vartheta \varthetaϑ\thetasym \thetasymϖ\varpi \varpi
ϱ\varrho \varrhoς\varsigma \varsigmaφ\varphi \varphiϝ\digamma \digamma

其他字母

ı\imath \imath∇\nabla \nablaℑ\Im \ImR\Reals \RealsŒ\text{\OE} \text{\OE}ȷ\jmath \jmath
∂\partial \partialℑ\image \image℘\wp \wpø\text{\o} \text{\o}ℵ\aleph \aleph⅁\Game \Game
k\Bbbk \Bbbk℘\weierp \weierpØ\text{\O} \text{\O}ℵ\alef \alefℲ\Finv \FinvN\N \N
Z\Z \Zß\text{\ss} \text{\ss}ℵ\alefsym \alefsymC\cnums \cnumsN\natnums \natnumsa˚\text{\aa} \text{\aa}
ı\text{\i} \text{\i}ℶ\beth \bethC\Complex \ComplexR\R \RA˚\text{\AA} \text{\AA}ȷ\text{\j} \text{\j}
ℷ\gimel \gimelℓ\ell \ellℜ\Re \Reæ\text{\ae} \text{\ae}ℸ\daleth \dalethℏ\hbar \hbar
ℜ\real \realÆ\text{\AE} \text{\AE}ð\eth \ethℏ\hslash \hslashR\reals \realsœ\text{\oe} \text{\oe}

布局

注解

5\cancel{5} \cancel{5}a+b+c⏞note\overbrace{a+b+c}^{\text{note}} \overbrace{a+b+c}^{\text{note}}
5\bcancel{5} \bcancel{5}a+b+c⏟note\underbrace{a+b+c}_{\text{note}} \underbrace{a+b+c}_{\text{note}}
ABC\xcancel{ABC}\xcancel{ABC}≠\not = \not =
abc\sout{abc} \sout{abc}π=cd\boxed{\pi=\frac c d} \boxed{\pi=\frac c d}
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\tag{hi} x+y^{2x}

x+y2x(hi)\tag{hi} x+y^{2x}

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\tag*{hi} x+y^{2x}

x+y2xhi\tag*{hi} x+y^{2x}

垂直

xnx_n x_n=!\stackrel{!}{=} \stackrel{!}{=}aba \atop b a \atop b
exe^x e^x=!\overset{!}{=} \overset{!}{=}=!\underset{!}{=} \underset{!}{=}
uo_u^o _u^o

重叠和间距

=/ {=}\mathllap{/\,} {=}\mathllap{/\,}(x2)\left(x^{\smash{2}}\right) \left(x^{\smash{2}}\right)
 /=\mathrlap{\,/}{=} \mathrlap{\,/}{=}y\sqrt{\smash[b]{y}} \sqrt{\smash[b]{y}}
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\sum_{\mathclap{1\le i\le j\le n}} x_{ij}

∑1≤i≤j≤nxij\sum_{\mathclap{1\le i\le j\le n}} x_{ij}

间距

公式结果公式结果
\,³∕₁₈ em 空格\kern{distance}空格，宽度 = distance
\thinspace³∕₁₈ em 空格\mkern{distance}空格，宽度 = distance
\>⁴∕₁₈ em 空格\mskip{distance}空格，宽度 = distance
\:⁴∕₁₈ em 空格\hskip{distance}空格，宽度 = distance
\medspace⁴∕₁₈ em 空格\hspace{distance}空格，宽度 = distance
\;⁵∕₁₈ em 空格\hspace*{distance}空格，宽度 = distance
\thickspace⁵∕₁₈ em 空格\phantom{content}间隔 content 的宽度和高度
\enspace½ em 空格\hphantom{content}间隔 content 的宽度
\quad1 em 空格\vphantom{content}间隔 content 的高度
\qquad2 em 空格\!– ³∕₁₈ em 空格
~non-breaking 的空格\negthinspace– ³∕₁₈ em 空格
\<space>空格\negmedspace– ⁴∕₁₈ em 空格
\nobreakspacenon-breaking 的空格\negthickspace– ⁵∕₁₈ em 空格
\space空格\mathstrut\vphantom{(}

逻辑与集合论

∀\forall \forall∁\complement \complement∴\therefore \therefore∅\emptyset \emptyset
∃\exists \exists⊂\subset \subset∵\because \because∅\empty \empty
∃\exist \exist⊃\supset \supset↦\mapsto \mapsto∅\varnothing \varnothing
∄\nexists \nexists∣\mid \mid→\to \to  ⟹  \implies \implies
∈\in \in∧\land \land←\gets \gets  ⟸  \impliedby \impliedby
∈\isin \isin∨\lor \lor↔\leftrightarrow \leftrightarrow  ⟺  \iff \iff
∉\notin \notin∋\ni \ni∌\notni \notni¬\neg \neg 或 \lnot

宏

x2+x2\def\foo{x^2} \foo + \foo\def\foo{x^2} \foo + \foo
`\gdef\bar#1