E. Set Theory – “Set It Up”

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Across
  1. 3. (∪) – Combines elements from sets.
  2. 4. (|A|) – Number of elements in a set.
  3. 6. (∃) – Existential quantifier.
  4. 7. (⊂) – Smaller than another set.
  5. 11. (∀) – Universal quantifier.
  6. 12. (ℕ) – Counting numbers.
  7. 13. (⊆) – Part of another set.
  8. 14. (⊇) – Contains another set.
Down
  1. 1. (∩) – Common elements between sets.
  2. 2. (⊃) – Larger than another set.
  3. 4. (A') – Elements outside set A.
  4. 5. (℘) – Set of all subsets.
  5. 8. (∅) – No elements in the set.
  6. 9. of (∉) – Not in a set.
  7. 10. (∈) – Belongs to a set.