LOGIC

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Across
  1. 1. x'
  2. 4. ∨
  3. 6. ^
  4. 9. if and only if (iff)
  5. 11. ∵
  6. 12. ∀
  7. 13. ⇒
  8. 14. or
  9. 15. !
Down
  1. 2. negation
  2. 3. |
  3. 5. ⊕
  4. 7. ∴
  5. 8. tilde
  6. 10. and