SET THEORY

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