set theory

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Across
  1. 3. The opposite of an intersection
  2. 5. The set containing all elements not in a particular set
  3. 7. A set that contains all possible elements
  4. 8. A set that includes all subsets of another set
  5. 10. A set that is not a subset of another set
  6. 11. A set whose elements are all part of another set
Down
  1. 1. The number of elements in a set
  2. 2. A set with more than one element
  3. 4. An element that belongs to a particular set
  4. 6. A set with exactly one element
  5. 9. A set that contains no elements
  6. 11. A collection of well-defined objects