Extensible Double Arrow \xleftrightarrow

When to use Extensible Double Arrow

Creates a stretchable bidirectional arrow with a label. In source, start from the exact \xleftrightarrow command instead of imitating the rendered glyph with Unicode characters or manual spacing. This keeps the expression editable and gives the renderer enough structure to apply mathematical spacing correctly.

Syntax

\xleftrightarrow

The documented syntax belongs to mathtools. Keep every required argument, brace pair, and environment boundary intact when moving the command between an editor, Markdown processor, notebook, or publishing system.

Example

A\xleftrightarrow{\phi}B

Rendered output

labeled equivalence arrow

Copy and compatibility checks

• Copy \xleftrightarrow exactly; changing its case or removing a leading backslash can turn it into plain text.
• Confirm that the destination loads mathtools before relying on this command.
• Render the example once, then inspect grouping, limits, scripts, and spacing before publishing.