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a+\frac{b}{c}

\sum_{k=1}^{n}k=\frac{n(n+1)}{2}

\begin{equation}a^2+b^2=c^2\tag{1}\end{equation}

\#\quad \$\quad \%\quad \&\quad \_\quad \{x\}\quad \backslash

\alpha,\beta,\gamma\qquad \Gamma,\Delta,\Omega

\epsilon,\varepsilon\qquad \phi,\varphi\qquad \theta,\vartheta

a\cdot b,\quad a\times b,\quad a\div b,\quad a\pm b

a\ne b,\quad x\leq y,\quad u\approx v,\quad f\propto g

A\cap B=\{x\mid x\in A\land x\in B\}

\forall x\in\mathbb{R},\ \exists n\in\mathbb{N},\ n>x

A\subsetneq B\subseteq C

f:\mathbb{R}\to\mathbb{R},\quad x\mapsto x^2

x>1\Rightarrow x^2>1

\frac{1}{2}\quad \dfrac{1}{2}\quad \tfrac{1}{2}

\sqrt{x^2+y^2}\qquad \sqrt[3]{a+b}

x_i^{n+1}+e^{-t}

\log_a b=\frac{\ln b}{\ln a}

f''(x)=\frac{d^2f}{dx^2},\qquad \frac{\partial f}{\partial y}

\lim_{h\to0}\frac{f(x+h)-f(x)}{h}

\int_a^b f(x)\,dx\qquad \iiint_\Omega g(x,y,z)\,dx\,dy\,dz

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

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

\vec{v}\qquad \overrightarrow{AB}\qquad \mathbf{v}\qquad \boldsymbol{\alpha}

\begin{aligned}x+y&=3\\2x-y&=0\end{aligned}

f(x)=\begin{cases}x,&x\geq0\\-x,&x<0\end{cases}

ab\quad a\,b\quad a\;b\quad a\!b\quad a\qquad b

x>0\quad\text{当且仅当}\quad -x<0

\mathbf{x}\quad \mathit{x}\quad \mathrm{x}\quad \mathtt{x}\quad \mathcal{L}\quad \mathbb{R}\quad \mathscr{L}

\textcolor{red}{x}+\textcolor{blue}{y}=z