Blackboard Bold Extended \mathbbm

When to use Blackboard Bold Extended

Provides additional blackboard-bold characters such as an indicator one. In source, start from the exact \mathbbm 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

\mathbbm

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

Example

\mathbbm{1}_A

Rendered output

indicator function

Copy and compatibility checks

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