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单词 complement
释义

complement

, complementation Let A be a subset of some universal set E. Then the complement of A is the set difference E\\A and may be denoted A′ or Ac or Ā when the universal set is understood or has been specified. Complementation (the operation of taking the complement) is a unary operation on the power set of E. The following properties hold:

(i) E′ = Ø and Ø′ = E.
(ii) For all A, (A′)′ = A.
(iii) For all A, A ∩ A′ = Ø and A ∪ A′ = E
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