Set theory symbols

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Across
  1. 2. A ∩ B
  2. 5. A×B
  3. 9. all the objects that do not belong to set A
  4. 11. set membership
  5. 13. A={3,9,14},B={3,9,14},A=B
  6. 14. |A|
  7. 15. set A is not a subset of set B
Down
  1. 1. a collection of elements
  2. 3. Ø
  3. 4. all subsets of A
  4. 6. A ⊇ B
  5. 7. set of all possible values
  6. 8. nfinite cardinality of natural numbers set
  7. 10. set A is not a superset of set B
  8. 12. A ∪ B