SET THEORY SYMBOLS

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Across
  1. 2. objects that belong to set A and set B
  2. 6. A ∪ B
  3. 8. |A| ,#A
  4. 10. set of all possible values
  5. 12. collection of 2 elements
  6. 14. infinite cardinality of natural numbers set
  7. 15. objects that belong to A or B but not to their intersection
Down
  1. 1. a collection of elements
  2. 3. R = {x | -∞ < x <∞}
  3. 4. both sets have the same members
  4. 5. all the objects that do not belong to set A
  5. 7. such that
  6. 9. cardinality of countable ordinal numbers set
  7. 11. Ø
  8. 13. A is a subset of B. set A is included in set B.