Euler, Gauss - Prolific Mathematicians

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Across
  1. 2. name of the formula: v - e + f = 2
  2. 5. idea that Gauss never published
  3. 7. Euler's nickname as a result of his blindness
Down
  1. 1. instrument used to reflect sunlight over great distances
  2. 3. called the "prince of mathematics"
  3. 4. 17 sided polygon
  4. 6. the most prolific mathematician of all time