\operatorname - LaTeX operator name command

\operatorname a

Renderer support

Package	MathJax	KaTeX	XeTeX
`ams`	MathJax: Full	KaTeX: Full	XeTeX: Full

Syntax#

\operatornames*starm:O{name}operator name

Argspec s m:O — one optional and one mandatory argument. Reading argspecs

\operatorname{rank} A

The star form places limits like \lim; the plain form keeps side scripts.

\operatorname*{arg\,max}_x f(x)

\operatorname{Tr}(\rho\sigma)

\operatorname*{lim}_{n}

TeXForm parses this entry as prefix syntax; the package determines its argument specification.

Rewrite plain operatorname arguments to equivalent base named-function or named-operator commands.

\operatorname{#1} \#1

\DeclareMathOperator{\myop}{name}approximate
Defines a new command that behaves like \operatorname{name}
\mathop{\mathrm{#2}}approximate
Operator spacing and font style are applied, similar to wrapping in \mathop and \mathrm, but \operatorname correctly handles limits positioning according to the star argument.

`ams`
Input	Case	MathJax	KaTeX	XeTeX
`\operatorname{a}`	Positive · baseline	Pass	Pass	Pass
`\operatorname*{a}`	Positive · vary:s[0]	Pass	Pass	Pass
`\operatorname a`	Positive · bare[1]	Pass	Pass	Pass