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commutator

  
   
1
(Math.) For a pair of operators (or matrices) A and B, the commutator is defined as:

[A,B]=AB-BA.

Commutators play an important role in, for example, quantum mechanics, particularly in the Heisenberg uncertainty principle.



2
(Phys.) Part of an electric motor or generator that connects successive segments of the rotor to the stator (or vice versa) to enable a continuous torque to be maintained (and hence current to be generated continuously). 		 

 

 

  
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