Rene Descartes

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Across
  1. 5. His nickname was?
  2. 6. The part of mathematics in which letters
  3. 7. Someone that studies theories
Down
  1. 1. Someone that calculates problems
  2. 2. Symbols are used to represent numbers and quantities in formula and equations?
  3. 3. The country Rene Descartes was born in?
  4. 4. The branch of mathematics concerned with properties?
  5. 8. Someone that studies facts