Logic symbols

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Across
  1. 2. ∃
  2. 4. ∀
  3. 7. ⇒
  4. 9. ⇔
  5. 10. ∵
  6. 11. ⋅
  7. 13. exclusive or - xor
  8. 14. &
  9. 15. negation
Down
  1. 1. and
  2. 3. !
  3. 5. +
  4. 6. ∨
  5. 8. not - negation
  6. 12. ¬