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Theorem 5.2.2 - Set Identities


Given any sets $A$, $B$, and $C$, the universal set $U$ and the empty set $\emptyset$:
1. Commutative laws: $A \cap B = B \cap A$
  $A \cup B = B \cup A$
2. Associative laws: $(A \cap B) \cap C = A \cap (B \cap C)$
  $(A \cup B) \cup C = A \cup (B \cup C)$
3. Distributive laws: $A \cup (B \cap C) = (A \cup B) \cap (A \cup C)$
  $A \cap (B \cup C) = (A \cap B) \cup (A \cap C)$
4. Intersection with U (Identity): $A \cap U = A$
5. Double Complement law: $(A')' = A$
6. Idempotent laws: $A \cap A = A$
  $A \cup A = A$
7. De Morgan's laws: $(A \cup B)' = A' \cap B'$
  $(A \cap B)' = A' \cup B'$
8. Union with U (Universals Bounds): $A \cup U = U$
9. Absorption laws: $A \cup (A \cap B) = A$
  $A \cap (A \cup B) = A$
10. Alternative Representation for Set Diff: $A - B = A \cap B'$




Chang Hu 2006-05-14

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