SET THEORY

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Across
  1. 9. collection of 2 elements
  2. 10. objects that belong to A and not to B
  3. 12. set A is not a subset of set B
  4. 14. such that
  5. 15. set of all possible values
Down
  1. 1. A'
  2. 2. all subsets of A
  3. 3. both sets have the same members
  4. 4. infinite cardinality of natural numbers set
  5. 5. A is a superset of B. set A includes set B
  6. 6. the number of elements of set A
  7. 7. objects that belong to set A and set B
  8. 8. A⋃B
  9. 11. Ø
  10. 13. a collection of elements