SET THEORY

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Across
  1. 2. A ⊇ B
  2. 4. ℵ
  3. 5. all the objects that do not belong to set A
  4. 9. A = B
  5. 11. a collection of elements
  6. 12. A ∩ B
  7. 14. Ø
Down
  1. 1. set of all possible values
  2. 3. ∈
  3. 5. |A|
  4. 6. A ∆ B
  5. 7. cardinality of countable ordinal numbers set
  6. 8. infinite cardinality of natural numbers set
  7. 10. A ∪ B
  8. 13. A ⊆ B