Set theory symbols

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Across
  1. 2. complement ∖
  2. 5. product ×
  3. 6. superset ⊃
  4. 8. ∪
  5. 11. difference −
  6. 13. ∩
  7. 14. set P(A)
  8. 15. ⊆
Down
  1. 1. ⊇
  2. 3. ∈
  3. 4. A'
  4. 7. subset ⊂
  5. 9. an element ∉
  6. 10. set U
  7. 12. set ∅