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In quantum mechanics , it is satisfied by operator commutators on a Hilbert space and , equivalently , in the phase space formulation of quantum mechanics by the Moyal bracket .
 person: Hilbert; person: Moyal
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Hilbert; person: Moyal