Algebra symbols

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Across
  1. 4. product - product of all values in range of series
  2. 5. infinite value
  3. 7. absolute value
  4. 8. identical to
  5. 9. change/diffirence
  6. 10. calculate expression inside first
Down
  1. 1. unknown value
  2. 2. sets
  3. 3. sum of all values in range of series
  4. 6. factional