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...''' we can ask for homomorphisms to associative algebras (endowed with the commutator bracket). The universal enveloping algebra '''U'''('''g''') is now defined

Two operators, ''Q'' and ''R'', are said to commute, if their commutator [''Q'', ''R''] is the zero operator, i.e., if

...tainty principle applies to all quantum mechanical operators that do not [[commutator|commute]].<ref name=Petrosyan/> In particular, it applies also to the elect ...tum field and the vector potential do not commute. That is, the equal-time commutator is:<ref name=Compagno/>

...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

...rators that do not commute (specifically, to every pair of operators whose commutator is a non-zero scalar operator).

...: the trivial group is solvable, and any other solvable group is one whose commutator subgroup is solvable. -- [[User:David Lee Harden|David Lee Harden]] 02:34,

*[[Commutator]]

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]].