Arrows (LaTeX2e unofficial reference manual (November 2018))

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#### 16.2.1 Arrows

These are the arrows that come with standard LaTeX. The `latexsym` and `amsfonts` packages contain many more.

Symbol | Command |
--- | --- | ---
⇓ | `\Downarrow` |
↓ | `\downarrow` |
↩ | `\hookleftarrow` |
↪ | `\hookrightarrow` |
← | `\leftarrow` |
⇐ | `\Leftarrow` |
⇔ | `\Leftrightarrow` |
↔ | `\leftrightarrow` |
⟵ | `\longleftarrow` |
⟸ | `\Longleftarrow` |
⟷ | `\longleftrightarrow` |
⟺ | `\Longleftrightarrow` |
⟼ | `\longmapsto` |
⟹ | `\Longrightarrow` |
⟶ | `\longrightarrow` |
↦ | `\mapsto` |
↗ | `\nearrow` |
↖ | `\nwarrow` |
⇒ | `\Rightarrow` |
→ | `\rightarrow`, or `\to` |
↘ | `\searrow` |
↙ | `\swarrow` |
↑ | `\uparrow` |
⇑ | `\Uparrow` |
↕ | `\updownarrow` |
⇕ | `\Updownarrow` |

An example of the difference between `\to` and `\mapsto` is: `\( f\colon D\to C \) given by \( n\mapsto n^2 \)`.

For commutative diagrams there are a number of packages, including `tikz-cd` and `amscd`.

Unofficial LaTeX2e reference manual