Leonhard Euler

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Across
  1. 1. The intersection of the altitudes in a triangle
  2. 6. The city where Euler was born
  3. 7. the type of astronomy that Euler was interested in
  4. 9. Euler's greatest discovery, in 1783, was The Law of _________ Reciprocity
  5. 10. In 1727 Euler joined the St. Petersburg _________ of Science
  6. 12. The center of the circumscribed circle of a triangle
  7. 13. The type of calculus that Euler worked with
Down
  1. 2. The symbol e is the base for __________ logarithms
  2. 3. The second Academy that Euler worked for
  3. 4. This theory of motion involves the three-body problem
  4. 5. The country where Euler was born
  5. 6. Euler spent the last years of his life completely ____
  6. 8. The concept in which variables are related to each other
  7. 11. The barycentre or "center of gravity" of a triangle