参考资料https://gavin_nicholas.coding.me/archives/
1. 如何输入括号和分隔符
() 、 [] 和 | 表示自己， {} 表示 {} 。当要显示大号的括号或分隔符时，要用 \left 和 \right 命令。
例子：$$f(x,y,z) = 3y^2z \left( 3+\frac{7x+5}{1+y^2} \right)$$ ,显示：
\[f(x,y,z) = 3y^2z \left( 3+\frac{7x+5}{1+y^2} \right)\]
有时候要用\left.或\right.进行匹配而不显示本身。
例子：$$\left. \frac{ {\rm d}u}{ {\rm d}x} \right| _{x=0}$$,显示：
\[\left. \frac{ {\rm d}u}{ {\rm d}x} \right| _{x=0}\]
1.1 偏导
$$\frac{\partial^{2}y}{\partial x^{2}}$$
\[\frac{\partial^{2}y}{\partial x^{2}}\]
2. 运算符：
| 关系运算符 | markdown语言 | 集合运算符 | markdown语言 | 对数运算符 | markdown语言 | 戴帽符号 | markdown语言 |
|---|---|---|---|---|---|---|---|
| \(\pm\) | $\pm$ |
\(\emptyset\) | $\emptyset$ |
\(\log\) | $\log$ |
\(\hat{y}\) | $\hat{y}$ |
| \(\times\) | $\times$ |
\(\in\) | $\in$ |
\(\lg\) | $\lg$ |
\(\check{y}\) | $\check{y}$ |
| \(\div\) | $\div$ |
\(\notin\) | $\notin$ |
\(\ln\) | $\ln$ |
\(\breve{y}\) | $\breve{y}$ |
| \(\mid\) | $\mid$ |
\(\subset\) | $\subset$ |
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| \(\nmid\) | $\nmid$ |
\(\supset\) | $\supset$ |
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| \(\cdot\) | $\cdot$ |
\(\subseteq\) | $\subseteq$ |
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| \(\circ\) | $\circ$ |
\(\supseteq\) | $\supseteq$ |
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| \(\ast\) | $\ast$ |
\(\bigcap\) | $\bigcap$ |
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| \(\bigodot\) | $\bigodot$ |
\(\bigcup\) | $\bigcup$ |
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| \(\bigotimes\) | $\bigotimes$ |
\(\bigvee\) | $\bigvee$ |
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| \(\bigoplus\) | $\bigoplus$ |
\(\bigvee\) | $\bigvee$ |
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| \(\leq\) | $\leq$ |
\(\bigwedge\) | $\bigwedge$ |
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| \(\geq\) | $\geq$ |
\(\biguplus\) | $\biguplus$ |
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| \(\neq\) | $\neq$ |
\(\bigsqcup\) | $\bigsqcup$ |
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| \(\approx\) | $\approx$ |
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| \(\equiv\) | $\equiv$ |
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| \(\sum\) | $\sum$ |
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| \(\prod\) | $\prod$ |
\(\sim\) | $\sim$ |
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| \(\coprod\) | $\coprod$ |
\(\backsim\) | $\backsim$ |
| 三角运算符 | markdown语言 | 微积分运算符 | markdown语言 | 逻辑运算符 | markdown语言 |
|---|---|---|---|---|---|
| \(\bot\) | $\bot$ |
\(\prime\) | $\prime$ |
\(\because\) | $\because$ |
| \(\angle\) | $\angle$ |
\(\int\) | $\int$ |
\(\therefore\) | $\therefore$ |
| \(30^\circ\) | $30^\circ$ |
\(\iint\) | $\iint$ |
\(\forall\) | $\forall$ |
| \(\sin\) | $\sin$ |
\(\iiint\) | $\iiint$ |
\(\exists\) | $\exists$ |
| \(\cos\) | $\cos$ |
\(\iiiint\) | $\iiiint$ |
\(\not=\) | $\not=$ |
| \(\tan\) | $\tan$ |
\(\oint\) | $\oint$ |
\(\not>\) | $\not>$ |
| \(\cot\) | $\cot$ |
\(\lim\) | $\lim$ |
\(\not\subset\) | $\not\subset$ |
| \(\sec\) | $\sec$ |
\(\infty\) | $\infty$ |
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| \(\csc\) | $\csc$ |
\(\nabla\) | $\nabla$ |
| 箭头符号 | markdown语言 |
|---|---|
| \(\uparrow\) | $\uparrow$ |
| \(\downarrow\) | $\downarrow$ |
| \(\Uparrow\) | $\Uparrow$ |
| \(\Downarrow\) | $\Downarrow$ |
| \(\rightarrow\) | $\rightarrow$ |
| \(\leftarrow\) | $\leftarrow$ |
| \(\Rightarrow\) | $\Rightarrow$ |
| \(\Leftarrow\) | $\Leftarrow$ |
| \(\longrightarrow\) | $\longrightarrow$ |
| \(\longleftarrow\) | $\longleftarrow$ |
| \(\Longrightarrow\) | $\Longrightarrow$ |
| \(\Longleftarrow\) | $\Longleftarrow$ |
特殊符号可以访问：Detexify
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