Who Am I?

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Across
  1. 3. introduced “∫”
  2. 4. Pascal’s Principle
  3. 6. Found the area of a circle
  4. 8. Prince of Math
  5. 10. e for the base of natural logarithms
  6. 12. I think, therefore I am
Down
  1. 1. Halleys comet
  2. 2. infinitesimal calculus.
  3. 5. There is no one center in the Universe
  4. 7. introduce infinity (∞)
  5. 9. binomial theorem.
  6. 11. analytic geometry.