Rene Descartes

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Across
  1. 2. equations
  2. 7. someone that studies theories
  3. 8. someone that calculates problems
  4. 9. are used to
Down
  1. 1. the country Rene Descartes
  2. 3. numbers and quantities in
  3. 4. the part of mathematics in which letters
  4. 5. his nickname was this
  5. 6. the branch of mathematics concerned with
  6. 10. someone that studies facts