Set Theory

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Across
  1. 5. set of all possible values
  2. 6. A ⊇ B
  3. 7. A ∩ B
  4. 9. |
  5. 12. all the objects that do not belong to set A
  6. 14. both sets have the same members
  7. 15. Ø = { }
Down
  1. 1. objects that belong to set A or set B
  2. 2. A ⊆ B
  3. 3. collection of 2 elements
  4. 4. the number of elements of set A
  5. 8. a collection of elements
  6. 10. infinite cardinality of natural numbers set
  7. 11. cardinality of countable ordinal numbers set
  8. 13. all subsets of A