SET THEORY

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Across
  1. 5. Ø
  2. 8. A = B
  3. 9. A ∩ B
  4. 12. A ⊄ B
  5. 13. A ⊂ B
  6. 14. A ∪ B
  7. 15. A ⊇ B
Down
  1. 1. (a,b)
  2. 2. DIFFERENCE A ∆ B
  3. 3. {}
  4. 4. A - B
  5. 6. |
  6. 7. A×B
  7. 10. A ⊆ B
  8. 11. |A|