\braket - LaTeX bra-ket command

\braket{\psi}

Renderer support

Package	MathJax	KaTeX	XeTeX
`braket`	MathJax: Full	KaTeX: Full	XeTeX: None
`physics`	MathJax: Full	KaTeX: Full	XeTeX: Full

Syntax#

\braketm{a}math content

Argspec m — one mandatory argument. In braket. Reading argspecs

\brakets*starm{a}math contentg{b}optional math content

Argspec s m g — two optional and one mandatory argument. In physics. Reading argspecs

braket

\braket{\psi | \phi}

braket

\braket{\phi | A | \psi}

physics

\braket{a}

physics

\braket{a}{b}

physics

\braket*{a}

physics

\braket*{a}{b}

Package	Signature	Allowed mode	Notes
`braket`	`m`	math	Used for bra-ket notation in quantum mechanics with fixed-size angle brackets.
`physics`	`s m g`	math	Used in quantum-mechanical bra-ket notation to typeset bra-ket inner products.

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

Expand braket to an explicit angle-bracket form with a middle bar.

\braket{#1}{#2} \left\langle #1 \middle\vert #2 \right\rangle

\innerproduct{#1}{#2}exact
Alias implemented by the same parse method; the same optional star and optional second braced group are also accepted.
\ip{#1}{#2}exact
Alias implemented by the same parse method; if the second braced group is omitted, MathJax duplicates #1 as the ket.

`braket`
Input	Case	MathJax	KaTeX	XeTeX
`\braket{a}`	Positive · baseline	Pass	Pass	Fail
`\braket a`	Positive · bare[0]	Pass	Pass	Fail

`physics`
Input	Case	MathJax	KaTeX	XeTeX
`\braket{a}`	Positive · baseline	Pass	Pass	Pass
`\braket*{a}`	Positive · vary:s[0]	Pass	Pass	Pass
`\braket{a}{b}`	Positive · vary:g[2]	Pass	Pass	Pass
`\braket*{a}{b}`	Positive · maximal	Pass	Pass	Pass
`\braket a`	Positive · bare[1]	Pass	Pass	Pass