Brahmagupta, an Indian mathematician and astronomer, is credited with developing the concept of the zero in the 7th century.

Aryabhatiya is a mathematical text written by Aryabhata in the 5th century. It covers topics such as arithmetic, algebra, trigonometry, and astronomy.

Brahmagupta developed the concept of negative numbers in the 7th century.

The angle addition postulate states that the sum of the angles of a triangle is always 180 degrees.

Aryabhata developed the concept of the decimal system in the 5th century.

Lilavati is a mathematical text written by Bhaskara II in the 12th century. It covers topics such as arithmetic, algebra, geometry, and astronomy.

Brahmagupta developed the concept of the Fibonacci sequence in the 7th century.

The prime number theorem states that the product of two prime numbers is always an odd number.

Bhaskara II developed the concept of the Pascal's triangle in the 12th century.

Srinivasa Ramanujan did not write any mathematical texts.

Brahmagupta developed the concept of modular arithmetic in the 7th century.

The Pythagorean theorem states that the sum of the squares of the two sides of a right triangle is equal to the square of the hypotenuse.

The concept of calculus was not developed by any Indian mathematician.

Surya Siddhanta is a mathematical text written by Suryadeva Yajvan in the 12th century. It covers topics such as astronomy, mathematics, and astrology.

The concept of the matrix was not developed by any Indian mathematician.