10 famous mathematician

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Across
  1. 1. explored planetary motion, solar and lunar eclipses
  2. 4. discovered the principle of buoyancy
  3. 6. known for his work on zero and negative numbers
  4. 8. formulated principles of reasoning
Down
  1. 2. Indian mathematician, collabarated with G.H Hardy
  2. 3. introduced concept of zero
  3. 5. ancient Greek
  4. 7. Father of geometry