Philosophically, Descartes was concerned with the existence of reality.
Chat with our AI personalities
i am i exist
Short answer: Descartes' doubt was like WWI - the doubt to end all doubt. Only by doubting everything could Descartes hope to find anything that was certain (even if the only certainty is that nothing else is certain!).
That he is sentient ie that he thinks.
Descartes did not invent polynomials.
Rene Descartes was a French mathematician who created coordinated geometry.