The Set Puzzle

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Across
  1. 4. - The number of elements in A
  2. 5. – A is strictly smaller than B
  3. 6. – A collection of distinct elements, e.g., {1, 2, 3}
  4. 9. – Combines elements from A and B
  5. 10. – A is a subset of B if all elements of A are in B
  6. 12. – Elements common to both A and B
  7. 13. – Elements in A but not in B
  8. 14. – A set with no elements
  9. 15. – Elements not in A but in U
Down
  1. 1. – An object that belongs to a set
  2. 2. – No shared elements
  3. 3. – Set of ordered pairs (a,b)
  4. 7. – A set with unlimited elements
  5. 8. – A set where elements can repeat
  6. 11. – A set that contains another set