Set Theory Symbols

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Across
  1. 4. symbol name of #A
  2. 8. set membership a∈A
  3. 9. collection of 2 elements(a,b)
  4. 11. symbol name of ⊇
  5. 15. symbol name of ∩
Down
  1. 1. symbol name of Z
  2. 2. symbol name of ⊖ or ∆
  3. 3. symbol name of A×B
  4. 5. symbol name of ⊆
  5. 6. symbol name of |
  6. 7. symbol name of P(A)
  7. 10. { }a collection of elements
  8. 12. Ø = { }
  9. 13. symbol name of ℵ0
  10. 14. symbol name of ∪