The major contribution of the French philosopher René Descartes was in the realm of

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René Descartes' major contribution was in the field of epistemology, which is the study of knowledge and belief. He is considered the father of modern Western philosophy and is famous for his phrase "Cogito, ergo sum" (I think, therefore I am), which is a key concept in his philosophy of knowledge. While he made contributions to other fields like mathematics and physics, his most significant contribution was in epistemology.

The Major Contribution of the French Philosopher René Descartes Was