Evaluation Bar \eval

When to use Evaluation Bar

Adds an evaluation bar with limits to an expression. In source, start from the exact \eval 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

\eval

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

Example

\eval{x^2}_0^1

Rendered output

evaluated from zero to one

Copy and compatibility checks

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