Crossword of Set Theory

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Across
  1. 3. A collection of elements
  2. 7. A ⊆ B
  3. 8. Set of all ordered pairs from A&B
  4. 10. All subset of A
  5. 11. |A|
  6. 12. Z
  7. 13. A ∪ B
Down
  1. 1. A ⊇ B
  2. 2. (a,b)
  3. 4. Both sets have the same members
  4. 5. Set of all possible values
  5. 6. Object that belong set A and set B
  6. 9. Ac