Set Theory

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Across
  1. 2. elements that belong to set A or set B
  2. 4. all subsets of C
  3. 5. both sets have the same members
  4. 7. A ⊅ B
  5. 11. few or all elements equal to the set
  6. 12. A ∆ B
  7. 15. C
Down
  1. 1. all the objects that do not belong to set A
  2. 3. equal to the set B
  3. 6. Z
  4. 8. collection of 2 elements
  5. 9. the number of elements of set
  6. 10. Ø = { }
  7. 13. numbers set Q
  8. 14. natural numbers