Set Theory Symbols

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Across
  1. 2. objects that belong to set A and set B
  2. 4. set A includes set B
  3. 6. A×B
  4. 8. ℚ
  5. 10. both sets have the same members
  6. 11. U
  7. 12. all the objects that do not belong to set A
Down
  1. 1. the number of elements of set A
  2. 3. ℂ
  3. 4. set A is included in set B.
  4. 5. a collection of elements
  5. 7. objects that belong to set A or set B
  6. 8. ℝ
  7. 9. infinite cardinality of natural numbers set
  8. 13. Ø