LOGIC

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Across
  1. 3. ∄
  2. 5. ~
  3. 7. not-negation
  4. 11. ∀
  5. 12. ^
  6. 13. V
  7. 15. •
Down
  1. 1. ∵
  2. 2. \
  3. 4. or/+
  4. 6. !
  5. 8. E
  6. 9. &
  7. 10. ∴
  8. 14. if and only if(iff)