Exploring Set Theory Symbols

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Across
  1. 3. P(A)
  2. 6. A ∪ B
  3. 9. Z
  4. 10. Ø
  5. 13. A ⊂ B
  6. 14. |A|
  7. 15. U
Down
  1. 1. C
  2. 2. |
  3. 4. A = B
  4. 5. A ⊆ B
  5. 7. a collection of elements
  6. 8. A×B
  7. 11. (a,b)
  8. 12. R