French philosopher and mathematician — author of Discourse on the Method and Meditations on First Philosophy — who created analytical geometry, the mind-body problem, and Cartesian doubt — whose cogito ergo sum is the most famous philosophical claim.
Creates the modern epistemological project — Descartes's method of radical doubt (rejecting everything that could possibly be doubted until reaching an indubitable foundation) and his cogito ergo sum (I think therefore I am) established the individual thinking mind as the starting point of modern philosophy and the mind-body problem as its defining puzzle.
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