SET OF THEORY

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Across
  1. 2. (A∪B)Union of sets A and B)
  2. 5. (A⊆B) A is a subset of B)
  3. 7. (A⊅B)A is not a superset of B)
  4. 9. (ℵ1)Next cardinality after ℵ0 in transfinite numbers)
  5. 10. (U) The universal set)
  6. 12. (A∩B)Intersection of sets A and B)
  7. 13. (P(A) The set of all subsets of A)
  8. 14. (#A) Number of elements in set A)
  9. 15. (R) The set of real numbers)
Down
  1. 1. (A=B)A is equal to B)
  2. 3. (A⊄B) A is not a subset of B)
  3. 4. (a∈A)"a is an element of A")
  4. 6. (Ac)Complement of A)
  5. 8. ((a,b) Represents an open interval in real numbers)
  6. 11. (ℵ0)Cardinality of the set of natural numbers)