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...elf-adjoint operator|self-adjointness]] of ''H'' and the definition of a [[commutator]] one has for an arbitrary operator ''G'',

where the bracket on the right-hand side is the commutator bracket of vector fields.

The square brackets indicate the [[commutator]] of two operators, defined for two arbitrary operators ''A'' and ''B'' as

The square brackets indicate a commutator, defined by

A set of symbols with a defined sum and a product taken as a commutator of the symbols is called a [[Lie algebra]].<ref name=LieAlgebra/> In partic

...d three light sources at the receiving end, with a [[commutator (electric)|commutator]] to alternate their illumination.

...these rules. A set of symbols with a defined sum and a product taken as a commutator of the symbols is called a [[Lie algebra]]. <ref name=LieAlgebra>For a math

...statement that the operators corresponding to certain observables do not [[Commutator|commute]].