Rene Descartes, who has been called the Father of Modern Philosophy, used alphabetic symbols to represent mathematical ideas. For instance, he used x to denote a variable.

Descartes invented the symbol used to indicate a square root, known as the radical symbol, which is shaped like a check mark. He also came up with modern exponential notation.

Both Francis Bacon and Rene Descartes created scientific methods. Francis Bacon was a philosopher and Rene Descartes was a philosopher and mathematician.

Rene Descartes valued rationality and human logic. Descartes is famous for his sentence, "I think, therefore I am." It was the mind that Descartes valued more than anything else.