*) - Indians made significant contributions to calculus, trigonometry, and algebra. The decimal system was invented in India in 100 B.C. The concept of zero as a number is also attributed to India.
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*) - Hindi and English are the official languages of India. The government also recognizes 17 other languages (Assamese, Bengali, Gujarati, Nepali, Manipuri, Konkani, Kannada, Kashmiri, Malayalam, Marathi, Oriya, Punjabi, Sanskrit, Sindhi, Tamil, Telugu, and Urdu). Apart from these languages, about 1,652 dialects are spoken in the country.
