physics/commutator-expand

Level

AuthoringFaithfulCorpusEquivFaithful, Corpus, and Equiv apply this rule.

Fidelity

renderPreserves rendering under the reference renderer.

Package

physics

Source

physics/faithful/commutator/commutator_expand.rs (opens in new tab)

Triggers

\comm command

Eliminates

\comm command

Produces

\left, \right commands

Rewrite patterns#

1. commutator-auto-sized\comm{#1}{#2}\left[#1,#2\right]
2. commutator-fixed-size\comm*{#1}{#2}[#1,#2]

Examples#

Each example shows this rule applied in isolation. A complete normalization profile may make additional changes.

\comm{L_x}{L_y}=i\hbar L_z

\left[L_x,L_y\right]=i\hbar L_z

\comm*{A}{B}=0

[A,B]=0

Related rules#

Same family#

• physics/expectation-expand Expand expectation-value helpers to explicit angle brackets.
• physics/matrixel-expand Expand matrix elements to explicit angle-bracket and bar fences.
• physics/physics-bra-expand Expand bra to an explicit angle-bracket and bar fence form.
• physics/physics-braket-expand Expand braket to an explicit angle-bracket form with a middle bar.
• physics/physics-ket-expand Expand ket to an explicit bar and angle-bracket fence form.
• physics/poisson-bracket-expand Expand poisson brackets to explicit brace fences.

Notes#

Covers the star branch, where star suppresses automatic fence sizing. Explicit big-size control after the command is parsed by MathJax but is outside the current argspec metadata and is outside this rule’s rewrite.

Disable this rule#

TransformEngine(profile="corpus", disable_rules=["physics/commutator-expand"])

new TransformEngine({ profile: 'corpus', disableRules: ['physics/commutator-expand'] })

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