字符

希腊字母

$\alpha$	$\beta$	$\gamma$	$\delta$	$\epsilon$	$\zeta$	$\eta$	$\theta$
\alpha	\beta	\gamma	\delta	\epsilon	\zeta	\eta	\theta
$\iota$	$\kappa$	$\lambda$	$\mu$	$\nu$	$\xi$	$\omicron$	$\pi$
\iota	\kappa	\lambda	\mu	\nu	\xi	\omicron	\pi
$\rho$	$\sigma$	$\tau$	$\upsilon$	$\phi$	$\chi$	$\psi$	$\omega$
\rho	\sigma	\tau	\upsilon	\phi	\chi	\psi	\omega

$\Gamma$	$\Delta$	$\Theta$	$\Lambda$	$\Xi$	$\Pi$	$\Phi$	$\Psi$
\Gamma	\Delta	\Theta	\Lambda	\Xi	\Pi	\Phi	\Psi
$\Sigma$	$\Upsilon$	$\Omega$
\Sigma	\Upsilon	\Omega

运算符号

$\lt$	$\gt$	$\le$	$\ge$	$\neq$
\lt	\gt	\le	\ge	\neq

$\times$	$\div$	$\pm$	$\mp$	$\cdot$
\times	\div	\pm	\mp	\cdot

$\cup$	$\cap$	$\setminus$	$\subset$	$\subseteq$	$\subsetneq$
\cup	\cap	\setminus	\subset	\subseteq	\subsetneq
$\supset$	$\in$	$\notin$	$\emptyset$	$\varnothing$	$\mid$
\supset	\in	\notin	\emptyset	\varnothing	\mid

$\to$	$\rightarrow$	$\leftarrow$	$\Rightarrow$	$\Leftarrow$	$\mapsto$
\to	\rightarrow	\leftarrow	\Rightarrow	\Leftarrow	\mapsto

$\land$	$\lor$	$\lnot$	$\forall$	$\exists$	$\top$	$\bot$	$\vdash$	$\vDash$
\land	\lor	\lnot	\forall	\exists	\top	\bot	\vdash	\vDash

$\star$	$\ast$	$\oplus$	$\circ$	$\bullet$	$\odot$
\star	\ast	\oplus	\circ	\bullet	\odot

$\approx$	$\sim$	$\simeq$	$\cong$	$\equiv$	$\prec$	$\lhd$
\approx	\sim	\simeq	\cong	\equiv	\prec	\lhd

$\infty$	$\aleph_0$	$\nabla$	$\partial$	$\Im$	$\Re$
\infty	\aleph_0	\nabla	\partial	\Im	\Re

<<<<<<< HEAD
|$\ldots$|$\ell$|$\epsilon$|$\varepsilon$|$\varphi$|
|:——:|:—-:|:——–:|:———–:|:——-:|
|\ldots|\ell|\epsilon|\varepsilon|\varphi|
=======
|$\ldots$|$\ell$|$\epsilon$|$\varepsilon$|$\varphi$|$\lceil x \rceil$|$\lfloor x \rfloor$|
|:——:|:—-:|:——–:|:———–:|:——-:|:—————-|:–|
|\ldots|\ell|\epsilon|\varepsilon|\varphi|\lceil x \rceil|\lfloor x \rfloor|

master

字体

blackboard bold: \mathbb or\Bbb $\mathbb {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$
boldface: \mathbf $\mathbf {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$
typewriter: \mathtt $\mathtt {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$
roman font: \mathrm $\mathrm {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$
sans-serif font: \mathsf $\mathsf {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$
calligraphic: \mathcal $\mathcal {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$
script:\mathscr $\mathscr {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$
Fraktur:\mathfrak $\mathfrak {ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnpqrstuvwxyz}$

实例

A_i\cap A_2\cap \cdots\cap A_n=\underset{i=1}{\overset{n}\bigcap}A_i
$$A_i\cap A_2\cap \cdots\cap A_n=\underset{i=1}{\overset{n}\bigcap}A_i$$
A_1\cup A_2\cup \cdots\cup A_n=\underset{i=1}{\overset{n}\bigcup}A_i
$$A_1\cup A_2\cup \cdots\cup A_n=\underset{i=1}{\overset{n}\bigcup}A_i$$
<<<<<<< HEAD

=======

```math
>>>>>>> master
\begin{align}
\overline {A\cap B} &= \{x\mid x\notin A\cap B\} \\
&   =\{x\mid \lnot(x\in(A\cap B))\} \\
&   =\{x\mid \lnot(x\in A\land x\in B)\} \\
&   =\{x\mid \lnot (x\in A)\lor \lnot(x\in B)\}\\
&   =\{x\mid x\notin A\lor x\notin B\}\\
&   =\{x\mid x\in \overline{A}\lor x\in \overline{B}\} \\
&   =\{x\mid x\in \overline{A}\cup\overline{B}\} \\
&   =\overline{A}\cup\overline{B}
\end{align}

$$ \begin{align}
\overline {A\cap B} &= {x\mid x\notin A\cap B} \
& ={x\mid \lnot(x\in(A\cap B))} \
& ={x\mid \lnot(x\in A\land x\in B)} \
& ={x\mid \lnot (x\in A)\lor \lnot(x\in B)}\
& ={x\mid x\notin A\lor x\notin B}\
& ={x\mid x\in \overline{A}\lor x\in \overline{B}} \
& ={x\mid x\in \overline{A}\cup\overline{B}} \
& =\overline{A}\cup\overline{B}
\end{align}
$$

<<<<<<< HEAD

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

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

1	(x+y)^n=\sum_{j=0}^n\left(\begin{array}{c}n \\r\end{array}\right)x^{n-1}y^i

$$(x+y)^n=\sum_{j=0}^n\left(\begin{array}{c}n \r\end{array}\right)x^{n-1}y^i$$

\left(
    \begin{array}{c}
    n \\
    r
    \end{array}
\right)

$$\left(\begin{array}{c}n \r\end{array}\right)$$

1 2	f(x)=\begin{cases}x^2+5\qquad x<0\\ x^3+5x+6\qquad x>0 \end{cases}

$$f(x)=\begin{cases}x^2+5\qquad x<0\
x^3+5x+6\qquad x>0 \end{cases}$$

master
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