SET THEORY

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