Set Theory

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Across
  1. 2. represented by the symbol "A ∩ B"
  2. 4. represented by the symbol "Ø"
  3. 8. represented by the symbol "ℝ"
  4. 9. represented by the symbol "|A|"
  5. 13. it means "such that"
  6. 14. set of all possible values
Down
  1. 1. represented by the symbol "(a,b)"
  2. 3. means all the objects that do not belong
  3. 5. represented by the symbol "A×B"
  4. 6. means all sets have the same members
  5. 7. represented by the symbol "A ∪ B"
  6. 10. represented by the symbol "P(A)"
  7. 11. represented by the symbol "A ⊇ B"
  8. 12. represented by the symbol "A ⊆ B"
  9. 15. a collection of elements