Equals Colon \eqqcolon

When to use Equals Colon

Typesets an equals-colon relation. In source, start from the exact \eqqcolon 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

\eqqcolon

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

x^2\eqqcolon f(x)

Rendered output

equals by definition

Copy and compatibility checks

• Copy \eqqcolon 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.