commutator

Etymology
(in the late 19th century), as is too.

Noun

 * 1) An electrical switch, in a generator or motor, that periodically reverses the direction of an electric current.
 * 2)  A binary map in a given group G, given by [g, h] = ghg−1h−1, where g and h are elements of G, which yields the group's identity if and only if the group operation commutes for g and h.
 * 3)  A binary map in a given ring R, given by [a, b] = ab − ba, where a and b are elements of R, which yields the ring's zero element if and only if the multiplication operation commutes for a and b.
 * 1)  A binary map in a given ring R, given by [a, b] = ab − ba, where a and b are elements of R, which yields the ring's zero element if and only if the multiplication operation commutes for a and b.

Translations

 * Finnish: ,
 * Japanese: 整流子
 * Maori: pūhuri hiko
 * Romanian: colector de comutație, (electric)
 * Swedish:


 * Hungarian:
 * Japanese: 交換子
 * Portuguese:
 * Turkish: değişeç


 * German: Kommutator
 * Japanese: 交換子
 * Swedish:
 * Turkish: değişeç