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commutator

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commutator
commutator (ˈkɒmjuːteɪtə(r)) [Agent-n. from L. commūtāre.] 1. a. He who or that which commutes or exchanges. spec. A contrivance in an electric machine or telegraph instrument for altering the direction or course of the electric current.1839 Grove Contrib. Sc. in Corr. Phys. Forces 253 A commutator ... Oxford English Dictionary
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Commutator (electric)
only two commutator segments. As the brush and commutator wear down, the spring steadily pushes the brush downwards towards the commutator. wikipedia.org
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commutator
commutator/ˈkɔmju:teɪtə(r); `kɑmjʊˌtetɚ/ ndevice for altering the direction of an electric current 整流器; 换向器. 牛津英汉双解词典
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Commutator subspace
Commutator subspaces, though, received sparse attention until the 1970s. The commutator subspace of J is a linear subspace of J denoted by Com(J) or [B(H),J]. wikipedia.org
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Portable Commutator
The Portable Commutator was a telecommunications device that was used by the military during World War I. wikipedia.org
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Explicit 4-term commutator $[A,B,C,D]$ The commutator of two terms is: $$ [A,B]=AB-BA $$ The commutator of three terms is: $$ [A,B,C]=ABC+BCA+CAB-BAC-CBA-ACB $$ I was not able to google the four term commutator, n...
Thus, your four-fold commutator would be a sum of 24 terms, 12 with a $+$ and 12 with a $-$.
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Ternary commutator
In mathematical physics, the ternary commutator is an additional ternary operation on a triple system defined by Also called the ternutator or alternating ternary sum, it is a special case of the n-commutator for n = 3, whereas the 2-commutator is the ordinary commutator. wikipedia.org
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character table and commutator It is well-known that an element of commutator subgroup may not be a commutator. Now there is a character-theory technique to check if an element of a group is a commutator. > An ele...
Isaacs: Commutators and the Commutator Subgroup. The American Mathematical Monthly. Vol. 84, No. 9 (Nov., 1977), pp. 720-722
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Commutator collecting process
The commutator collecting process was introduced by Philip Hall in 1934 and articulated by Wilhelm Magnus in 1937. Hall sets are used to construct a basis for a free Lie algebra, entirely analogously to the commutator collecting process. wikipedia.org
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On the commutator subgroup of a group Prove that there is no group $G$ such that the commutator subgroup of $G$ to be $S_{3}$.
Denote the commutator subgroup of a group $G$ by $G'$. Since $S_3$ is complete, you could proceed as in this question.
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Mercury swivel commutator
A mercury swivel commutator is an electrical commutator typically used in electrophysiological experiments on head free or moving animals. Slip rings however inject commutator noise into the connection. wikipedia.org
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The radical of the commutator subgroup Is the solvable radical of the commutator subgroup $G'$ of a group $G$ normal in $G$?
Yes, because the commutator subgroup is a characteristic subgroup of $G$.
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CN101540528B - Process for manufacturing bank-type commutator segment ...
The invention discloses a process for manufacturing a band-type commutator segment group provided with a dovetail and used for a commutator, and the process comprises the following steps of: firstly implementing temperature extrusion processing on a copper wire to form the band-type commutator segment group, later implementing drawing processing on the band-type commutator segment group, and ...
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With many coils connected to the commutator, sparking will occur as the ...
With many coils connected to the commutator, sparking will occur as the current collecting brushes move across the insulated segments. Commutating poles or interpoles are used to reduce this sparking.
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泊松括号（Poisson bracket）是怎么量子化到对易子（commutator）的？
Heisenberg假设每一个牛顿力学的动力量应该用一个矩阵表示： 我们容易想到矩阵是不对易的，即 那么对易子应该不等于零。 对易子应该等于多少呢？ Dirac解决了这个问题！ Dirac想到了分析力学的泊松括号， 它具有以下七个性质： 而这七个性质，对易子也具有！ Dirac猜想分析力学与量子力学应该是对应的，两者应该是渐变的，一个世界不应该用两套格格不入的理论来解释。 于是Dirac提出 用一个常数D连接了经典力学和量子力学。 利用氢原子光谱，计算得， 这就是量子力学基本方程！ zhihu
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