History of Math

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Across
  1. 4. What branch of mathematics did René Descartes help create?
  2. 8. What ancient civilization used hieroglyphs to represent numbers and did early algebra?
  3. 10. Who wrote the book Principia Mathematica?
  4. 11. Which German mathematician is known for his contributions to number theory and the "Disquisitiones Arithmeticae"?
  5. 12. Which ancient civilization used a base-60 number system?
Down
  1. 1. What is the famous sequence named after Leonardo of Pisa (Fibonacci)?
  2. 2. Which mathematician formulated the Pythagorean Theorem?
  3. 3. What Indian mathematician is known for early work on zero and infinity?
  4. 5. Who is known as the "father of geometry"?
  5. 6. What is the name of the famous Greek mathematician who ran naked shouting "Eureka!"?
  6. 7. What French mathematician is known for his work in probability theory with Blaise Pascal?
  7. 9. Who is the Persian mathematician known as the "father of algebra"?