Set theory symbols

123456789101112131415
Across
  1. 3. number set Z
  2. 5. A∆B
  3. 7. set 2A
  4. 10. complement A/B
  5. 12. A=B
  6. 14. number set R
  7. 15. set O
Down
  1. 1. set U
  2. 2. AUB
  3. 4. complement A-B
  4. 6. number set C
  5. 8. number set Q
  6. 9. |A|
  7. 11. {}
  8. 13. pair (a,b)