The Set theory symbols

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Across
  1. 4. such that,|
  2. 7. Ø
  3. 8. set of all possible values
  4. 12. A is a superset of B. set A includes set B
  5. 14. A ∪ B
  6. 15. A ⊄ B
Down
  1. 1. both sets have the same members
  2. 2. collection of 2 elements
  3. 3. A×B
  4. 5. A ∩ B
  5. 6. a collection of elements
  6. 9. A is a subset of B. set A is included in set B.
  7. 10. all the objects that do not belong to set A
  8. 11. |A|
  9. 13. cardinality of countable ordinal numbers set