SET THEORY

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Across
  1. 6. A ⊖ B
  2. 8. A = B
  3. 9. A ⊆ B
  4. 10. Ø
  5. 11. A is a superset of B. set A includes set B.
  6. 13. (a,b)
  7. 14. a collection of elements
  8. 15. A ∪ B
Down
  1. 1. A - B
  2. 2. |A|
  3. 3. A is a subset of B. set A is included in set B.
  4. 4. A ⊇ B
  5. 5. objects that belong to set A or set B
  6. 7. A ∩ B
  7. 12. |