LOGIC SYMBOLS

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Across
  1. 3. The symbol is ∃
  2. 6. The symbol is &
  3. 9. The symbol is ⇒
  4. 10. It mean negation
  5. 11. It means 'or' with a symbol of ∨
  6. 13. The symbol is ∀
  7. 15. It mean not-negation with a symbol of x'
Down
  1. 1. Used also as 'and' with a symbol of (^)
  2. 2. The symbol is ∵
  3. 4. The symbol is ∴
  4. 5. The symbols is ↔
  5. 7. The symbol is ¬
  6. 8. Means 'and' with a symbol of (.)
  7. 12. The symbol is !
  8. 14. It means exclusive or -xor