Fundamental Symbols of Mathematics

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Across
  1. 2. Than <
  2. 5. Than or Equal To ≤
  3. 7. %
  4. 9. +
  5. 11. ∝
  6. 12. ∑
  7. 13. Than >
  8. 15. |x|
  9. 16. ∠
  10. 17. ÷
  11. 20. ∏
Down
  1. 1. ±
  2. 3. !
  3. 4. ×
  4. 6. =
  5. 8. Than or Equal To ≥
  6. 10. √
  7. 14. ∞
  8. 18. -
  9. 19. Equal ≠