ALGEBRA SYMBOLS

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Across
  1. 1. unknown value to find x
  2. 4. Δ = b2 - 4ac
  3. 6. WEAK APPROXIMATION
  4. 10. ≜
  5. 13. ABSOLUTE VALUE| x |
  6. 18. ∏
  7. 19. calculate expression inside first
  8. 20. SET { }
  9. 21. ∑
Down
  1. 2. INFINITY SYMBOL
  2. 3. ≫
  3. 5. (a,b) = {x | a < x < b}
  4. 6. APPROXIMATION ≈
  5. 7. (f ∘ g) (x) = f (g(x))
  6. 8. rounds number to upper integer
  7. 9. [a,b] = {x | a ≤ x ≤ b}
  8. 11. change / difference
  9. 12. ∝
  10. 14. ≪
  11. 15. IDENTICAL TO ≡
  12. 16. golden ratio constant φ
  13. 17. double summation ∑∑