Math

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Across
  1. 3. Famous Russian female mathematician
  2. 5. Euclid is called the father of this
  3. 6. Cipher used by JFK
Down
  1. 1. sinA/a=sinB/b=sinC/c
  2. 2. The Pythagorean this
  3. 4. Eratosthenes occupation
  4. 7. Author of Flatland