Set Theory Symbols

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Across
  1. 2. (a,b)
  2. 6. Ø
  3. 8. Q
  4. 9. AUB
  5. 11. U
  6. 12. A-B
  7. 13. A=B
  8. 14. {}
  9. 15. ACB
Down
  1. 1. R
  2. 3. C
  3. 4. A∆B
  4. 5. |A|
  5. 7. all the object that do not belong to Set A
  6. 10. objects that belong to Set A and B