Set Theory Symbols

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Across
  1. 3. ℵ0
  2. 4. Ø
  3. 6. ℂ
  4. 9. A ∩ B
  5. 10. 𝕌
  6. 11. ℝ
  7. 13. (a,b)
Down
  1. 1. A = B
  2. 2. A \ B
  3. 5. { }
  4. 6. | A |
  5. 7. ℤ Symmetricdifference A∅B
  6. 8. A×B
  7. 12. A ∪ B