What did Rene Descartes make in math?

Answer 1

René Descartes made significant contributions to mathematics, most notably the development of Cartesian coordinates, which link algebra and geometry through a coordinate system. This innovation allowed geometric shapes to be expressed as algebraic equations, laying the groundwork for analytical geometry. Descartes also contributed to the field of calculus and introduced the concept of using letters to represent variables and constants in equations, which greatly influenced mathematical notation. His work fundamentally changed the way mathematics is approached and studied.