Logic Symbols by

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Across
  1. 3. (+)
  2. 5. (Decimal or Multiplication) (·)
  3. 7. (Superscript) (aᵇ)
  4. 12. (±)
  5. 13. (())
  6. 14. (∓)
  7. 16. (≥)
  8. 17. ([])
  9. 18. Equal To (≠)
  10. 19. (-)
  11. 20. (>)
Down
  1. 1. (<)
  2. 2. Root (√a)
  3. 4. (≤)
  4. 6. Exponentiation (a^b)
  5. 8. (mod)
  6. 9. (×)
  7. 10. (=)
  8. 11. To (≈)
  9. 15. (Overline) (—)