LOGIC SYMBOLS

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