Set Theory Symbols

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Across
  1. 1. ∴
  2. 2. ⊕
  3. 4. ⇔
  4. 6. x'
  5. 11. !
  6. 13. ⋅
  7. 14. ∨
Down
  1. 1. negation
  2. 3. +
  3. 5. &
  4. 7. ∵
  5. 8. ⇒
  6. 9. ∀
  7. 10. not-negation
  8. 12. ^