\root - LaTeX fraction command

\root\of{x}

Renderer support

Package	MathJax	KaTeX	XeTeX
`base`	MathJax: Full	KaTeX: None	XeTeX: Full

Syntax#

\rootu{\of}a\ofmath contentm{b}math content

Argspec u{\of} m — two mandatory arguments. Reading argspecs

\root n_i\of{x}

\root{n_i}\of{x}

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

Rewrite legacy root-of syntax to bracketed sqrt notation.

\root #1 \of #2 \sqrt[#1]{#2}

\sqrt[#1]{#2}approximate
For ordinary nth-root usage this matches \sqrt[#1]{#2} semantically, but MathJax's \sqrt has an extra convenience case for an unbraced following \frac that \root does not.

`base`
Input	Case	MathJax	KaTeX	XeTeX
`a \root 3 \of x`	Positive · ctx:basic	Pass	Fail	Pass