Set theory symbols

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Across
  1. 7. A ⊂ B subset
  2. 8. A ∩ B
  3. 11. A ∪ B
  4. 12. A ∆ B difference
  5. 14. A \ B complement
Down
  1. 1. A×B product
  2. 2. A = B
  3. 3. |A|
  4. 4. (a,b) pair
  5. 5. A ⊃ B superset
  6. 6. Ac
  7. 7. 2A set
  8. 9. A ⊇ B
  9. 10. A ⊆ B
  10. 13. {}