Madhava of Sangamagrama, who lived in the 14th century, is credited with developing the concept of the derivative and the mean value theorem, which are fundamental to calculus.

Madhava of Sangamagrama developed the Madhava series, also known as the Gregory series, to approximate the sine function. This series is similar to the Taylor series and the Maclaurin series, but it was developed independently by Madhava.

Bhaskara II, who lived in the 12th century, made significant contributions to the concept of infinity and the idea of limits. He developed the concept of the infinite series and used it to solve various mathematical problems.

Bhaskara II developed a theorem, known as Bhaskara's theorem, which provides a formula for finding the area of a circle. This theorem is similar to the formula for the area of a circle that is commonly used today.

Madhava of Sangamagrama developed the concept of the derivative and the mean value theorem, which are fundamental to calculus. His work on these concepts predates the work of Isaac Newton and Gottfried Wilhelm Leibniz, who are often credited with the development of calculus.

Madhava of Sangamagrama developed the Madhava series, also known as the Gregory series, to approximate the value of pi. This series is similar to the Taylor series and the Maclaurin series, but it was developed independently by Madhava.

Madhava of Sangamagrama developed the concept of the integral, which is a fundamental concept in calculus. He developed a method for finding the area under a curve, which is known as the method of exhaustion.

Madhava of Sangamagrama developed a theorem, known as Madhava's theorem, which provides a formula for finding the area under a curve. This theorem is similar to the formula for the area under a curve that is commonly used today.

Bhaskara II developed the concept of the infinite series and used it to solve various mathematical problems. He developed a formula for the sum of an infinite series, which is known as Bhaskara's formula.

Bhaskara II developed the Bhaskara series, also known as the Gregory series, to approximate the value of pi. This series is similar to the Taylor series and the Maclaurin series, but it was developed independently by Bhaskara.

Madhava of Sangamagrama developed the concept of the differential equation, which is a fundamental concept in calculus. He developed a method for solving differential equations, which is known as the method of exhaustion.

Madhava of Sangamagrama developed a theorem, known as Madhava's theorem, which provides a formula for solving differential equations. This theorem is similar to the formula for solving differential equations that is commonly used today.

Srinivasa Ramanujan, who lived in the 20th century, made significant contributions to the concept of the Laplace transform. He developed a method for finding the Laplace transform of a function, which is known as Ramanujan's method.

Srinivasa Ramanujan developed a theorem, known as Ramanujan's theorem, which provides a formula for finding the Laplace transform of a function. This theorem is similar to the formula for finding the Laplace transform that is commonly used today.

Srinivasa Ramanujan, who lived in the 20th century, made significant contributions to the concept of the Fourier series. He developed a method for finding the Fourier series of a function, which is known as Ramanujan's method.