markdown中简单的数学公式及常用字符

1.分数x+yx−y
$\frac{x+y}{x-y}$
2.上标A2n
$A^{2n}$
3.下标A2n
$A_{2n}$
4.开方8√3
$\sqrt[3]{8}$
5.求和∑∞i=1i
$\sum_{i-1}^{\infty}{i}$
6.积分∫∞0xdx
$\int_{0}^{\infty}{xdx}$
7.∏
$\prod$
8.矩阵

[1223]

\begin{bmatrix}1 & 2 \\ 2 & 3\end{bmatrix}

9.±∓×÷∪∩∧∨⊗⊕⊖⊙
\pm \mp \times \div \cup \cap \wedge \vee \otimes \oplus \ominus \odot
10. sincosmaxminlim−→lim←−
$\sin \cos \max \min \varinjlim \varprojlim$
11.αβγδϵεθλπρστϕφψω
$\alpha \beta \gamma \delta \epsilon \varepsilon \theta \lambda \pi \rho \sigma \tau \phi \varphi \psi \omega$
12.≤≥≠≪≫⊂⊆≡∼≃
$\le \ge \neq \ll \gg \subset \subseteq \equiv \sim \simeq$