INDIAN MATHEMATICS

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Across
  1. 2. the symbol used to represent the number '0' in the Hindu Decimal System
  2. 3. Surname of the genius who proved over 3000 theorems and equations
  3. 6. the human computer
Down
  1. 1. developed arithmetic sums using the new 0 and negative numbers
  2. 4. found the approximation and formula of π
  3. 5. first person to use 0