SET THEORY SYMBOLS

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Across
  1. 3. set P(A)
  2. 5. subset ⊂
  3. 6. difference Δ
  4. 7. {}
  5. 10. ∪
  6. 12. superset ⊅
  7. 13. ⊆
  8. 15. ∉
Down
  1. 1. ⊈
  2. 2. ∩
  3. 4. ∅
  4. 8. =
  5. 9. of ∈
  6. 11. ⊇
  7. 14. complement A - B