Crack My Crackers

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Across
  1. 6. set.A ⊇ B
  2. 8. difference.A ∆ B
  3. 10. A = B
  4. 11. A ⊆ B
  5. 14. A ∩ B
  6. 15. bar.|
Down
  1. 1. set. U
  2. 2. pair.(a,b)
  3. 3. |A|
  4. 4. set.Ø
  5. 5. {}
  6. 7. A ∪ B
  7. 9. Ac
  8. 12. set.2A
  9. 13. complement.A \ B