SET THEORY SYMBOLS

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Across
  1. 1. Z
  2. 3. cardinality of countable ordinal numbers set
  3. 4. R
  4. 9. 2A
  5. 10. A ∪ B
  6. 12. set of all possible values
  7. 13. Ac
  8. 15. infinite cardinality of natural numbers set
  9. 17. A ∩ B
  10. 19. collection of 2 elements
  11. 20. a collection of elements
Down
  1. 2. A ⊇ B
  2. 5. A ⊄ B
  3. 6. A ⊆ B
  4. 7. |A|
  5. 8. A×B
  6. 11. C
  7. 14. Ø
  8. 16. A = B
  9. 18. such that