commutator ( synonym found)
Definition of commutator:

°an electrical switch, in a generator or motor, that periodically reverses the direction of an electric current.
°(of a group) an element of the form ghg-1h-1 where g and h are elements of the group; it is equal to the group's identity if and only if g and h commute.
Definition of commutator:

°an electrical switch, in a generator or motor, that periodically reverses the direction of an electric current.
°(of a group) an element of the form ghg-1h-1 where g and h are elements of the group; it is equal to the group's identity if and only if g and h commute.
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