Set theory symbols

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1234567891011121314
Across
  1. 2. |
  2. 4. A ∪ B
  3. 6. Ø
  4. 7. (a,b)
  5. 8. |A|
  6. 10. A ⊂ B
  7. 11. A ⊆ B
  8. 13. { }
  9. 14. Ac
Down
  1. 1. A×B
  2. 3. A ∆ B
  3. 5. A ⊅ B
  4. 6. A = B
  5. 9. A ∩ B
  6. 12. \mathbb{U}