Algebra Symbols

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Across
  1. 3. sign =
  2. 5. double summation
  3. 7. ≈
  4. 8. Δ = b2 - 4ac
  5. 9. ≠
Down
  1. 1. change / difference
  2. 2. ≡
  3. 4. set
  4. 6. calculate expression inside first
  5. 10. infinity symbol