sets

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Across
  1. 2. A character used to denote set operations (like ∪ or ∈)
  2. 4. Sets that have no elements in common
  3. 7. A set that has no elements
  4. 9. Sets having exactly the same elements
  5. 10. A subset that is not equal to the original set
  6. 12. Type of diagram used to show relationships between sets
  7. 13. Number of elements in a set
  8. 15. Elements not in a given set, relative to the universal set
  9. 16. The set containing only the common elements of sets
  10. 18. A set that contains all elements under consideration
  11. 19. A set whose elements are all contained in another set
Down
  1. 1. The relation shown by the symbol ∈
  2. 3. A set with a countable number of elements
  3. 5. A pair of elements where order matters
  4. 6. The set of all subsets of a given set
  5. 8. A member of a set
  6. 11. The set containing all elements from two or more sets
  7. 14. A method of representing a set by listing its elements
  8. 17. A set with uncountable or endless elements
  9. 20. A well-defined collection of distinct objects