SET THEORY

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Across
  1. 4. objects that belong to set A and set B
  2. 8. ℚ
  3. 12. collection of 2 elements
  4. 13. objects that belong to A and not to B
  5. 14. objects that belong to A or B but not to their intersection
  6. 15. A ⊅ B
Down
  1. 1. the number of elements of set A
  2. 2. set membership
  3. 3. set of all possible values
  4. 5. ℝ
  5. 6. not set membership
  6. 7. A ⊇ B
  7. 9. a collection of elements
  8. 10. All subset of A
  9. 11. set of allordered pairs from A and B