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4.集合

幂集

A = {a,b}

\[P(A) = \{\emptyset,{a},{b},{a,b} \}\]

对称差

Note

  • 对称差不满足幂等律即
  • \(A\oplus A \neq A \eq \emptyset\)
\[A \oplus B = (A-B) \cup (B-A) = (A\cup B) - (A\cap B)\]

绝对补

\[\sim A = E-A\]