Parameshvara was a renowned mathematician and astronomer from Kerala, India, who lived in the 14th and 15th centuries.

Parameshvara's most famous work is Lilavati, a treatise on mathematics that covers topics such as arithmetic, algebra, geometry, and astronomy.

Lilavati is significant because it is the first book on mathematics to provide a systematic treatment of algebra, including topics such as the solution of linear and quadratic equations, the use of variables, and the concept of negative numbers.

Parameshvara's main contribution to the development of algebra was his development of a method for solving quadratic equations, which he presented in Lilavati.

The method that Parameshvara developed for solving quadratic equations is the completing the square method, which involves adding and subtracting a constant term to both sides of the equation in order to make it a perfect square.

Parameshvara's method for solving quadratic equations is significant because it is the first method that was developed using algebraic symbols, which allowed for a more general and systematic approach to solving these equations.

In addition to his method for solving quadratic equations, Parameshvara also developed a method for solving indeterminate equations, which are equations that have an infinite number of solutions.

Parameshvara's contributions to algebra were significant because they helped to lay the foundation for the development of modern algebra, they helped to spread the knowledge of algebra to other parts of the world, and they helped to stimulate the development of other branches of mathematics.

Parameshvara's legacy is that he is considered to be one of the greatest mathematicians of his time, one of the founders of modern algebra, and one of the most influential mathematicians in Indian history.

Parameshvara wrote a commentary on Bhaskara II's Lilavati called Vivarana, which provides explanations and additional insights into the mathematical concepts discussed in the original text.

Parameshvara wrote a commentary on Bhaskara II's Bijaganita called Bhasya, which provides explanations and additional insights into the algebraic concepts discussed in the original text.

Parameshvara wrote a commentary on Aryabhata's Aryabhatiya called Vritti, which provides explanations and additional insights into the mathematical and astronomical concepts discussed in the original text.

Parameshvara wrote a commentary on Madhava's Madhaviya called Tika, which provides explanations and additional insights into the mathematical concepts discussed in the original text.

Parameshvara wrote a commentary on Nilakantha's Tantrasangraha called Vivarana, which provides explanations and additional insights into the mathematical and astronomical concepts discussed in the original text.

Parameshvara wrote a commentary on Jyeshtadeva's Yuktibhasa called Bhasya, which provides explanations and additional insights into the mathematical concepts discussed in the original text.