E. Set Theory

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Across
  1. 3. infinity cardinality of natural subset
  2. 7. objects that belong to set A or B
  3. 8. both sets have the same number
  4. 10. objects that belong to set A and set B
  5. 12. collection of two elements
  6. 14. set A is a superset of B
  7. 15. phi
Down
  1. 1. all the objects that do not belong to set A
  2. 2. set membership
  3. 4. set of all possible values
  4. 5. cardinality of countable ordinal number set
  5. 6. a collection of elements
  6. 9. the number of elements of set A
  7. 11. all subsets of A
  8. 13. set A is a subset of B