0. hat
$abchat def$
$abwidehat{cde}f$
$abwidehat{cde}f$1. 箭头上的文字
$underrightarrow{ ext{你的文字}}$
（$A xleftarrow{n=0} B xrightarrow[T]{n>0} C$）
定义：≜（ riangleq）
2. 特殊的箭头
3. 下标
4. 在符号底部写符号：underset
underset{0leq j leq k-1}{argmin}
A 在 B 下
underset{A}{B}
5. 在符号下部换行：understack
sum_{substack{0<i<n \ 0<j<n}} A_{ij}
6. Latex 符号总结(各种箭头符号)
| latex | 显示效果 |
|---|---|
| uparrow | ↑↑ |
| downarrow | ↓↓ |
| Uparrow | ⇑⇑ |
| Downarrow | ⇓⇓ |
| updownarrow | ↕↕ |
| Updownarrow | ⇕⇕ |
| ightarrow | →→ |
| leftarrow | ←← |
| Rightarrow | ⇒⇒ |
| Leftarrow | ⇐⇐ |
| leftrightarrow | ↔↔ |
| Leftrightarrow | ⇔⇔ |
| longrightarrow | ⟶⟶ |
| longleftarrow | ⟵⟵ |
| Longrightarrow | ⟹⟹ |
| Longleftarrow | ⟸⟸ |
| longleftrightarrow | ⟷⟷ |
| Longleftrightarrow | ⟺ |
| latex | 显示效果 |
|---|---|
| mapsto | ↦↦ |
| longmapsto | ⟼⟼ |
| hookleftarrow | ↩↩ |
| hookrightarrow | ↪↪ |
| leftharpoonup | ↼↼ |
| ightharpoonup | ⇀⇀ |
| leftharpoondown | ↽↽ |
| ightharpoondown | ⇁⇁ |
| ightleftharpoons | ⇌⇌ |
| leadsto | ⇝⇝ |
earrow |
↗↗ |
| searrow | ↘↘ |
| swarrow | ↙↙ |
warrow |
↖↖ |
leftarrow |
↚↚ |
rightarrow |
↛↛ |
Leftarrow |
⇍⇍ |
Rightarrow |
⇏⇏ |
leftrightarrow |
↮↮ |
Leftrightarrow |
⇎⇎ |
| dashrightarrow | ⇢⇢ |
| dashleftarrow | ⇠⇠ |
| leftleftarrows | ⇇⇇ |
| leftrightarrows | ⇆⇆ |
| Lleftarrow | ⇚⇚ |
| woheadleftarrow | ↞↞ |
| leftarrowtail | ↢↢ |
| looparrowleft | ↫↫ |
| leftrightharpoons | ⇋⇋ |
| curvearrowleft | ↶↶ |
| circlearrowleft | ↺↺ |
| Lsh | ↰↰ |
| upuparrows | ⇈⇈ |
| upharpoonleft | ↿↿ |
| downharpoonleft | ⇃⇃ |
| multimap | ⊸⊸ |
| leftrightsquigarrow | ↭↭ |
| ightrightarrows | ⇉⇉ |
| ightleftarrows | ⇄⇄ |
| ightrightarrows | ⇉⇉ |
| ightleftarrows | ⇄⇄ |
| woheadrightarrow | ↠↠ |
| ightarrowtail | ↣↣ |
| looparrowright | ↬↬ |
| ightleftharpoons | ⇌⇌ |
| curvearrowright | ↷↷ |
| circlearrowright | ↻↻ |
| Rsh | ↱↱ |
| downdownarrows | ⇊⇊ |
| upharpoonright | ↾↾ |
| downharpoonright | ⇂⇂ |
| ightsquigarrow | ⇝ |
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