Did you know they were Phoenician?

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Across
  1. 1. - Mathematician whose theorem helps to find the measure of a rectangular triangle
  2. 3. Jurist from Beirut in favor of the equality for all, counselor of Septime Severe,
  3. 5. Philosopher, founder of Stoicism
  4. 6. Father of Geometry
Down
  1. 2. Mathematician descendant of the King of Tyre, Agenor
  2. 4. Scientist and founder of the Atom Theory