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  1. Dec 3, 2008 · During the course of his life, he was a mathematician first, a natural scientist or “natural philosopher” second, and a metaphysician third. In mathematics, he developed the techniques that made possible algebraic (or “analytic”) geometry.

  2. Dec 3, 1997 · René Descartes (1596–1650) is widely regarded as a key figure in the founding of modern philosophy. His noteworthy contributions extend to mathematics and physics. This entry focuses on his philosophical contributions to the theory of knowledge.

  3. Mar 14, 2007 · Ideas are among the most important items in Descartesphilosophy. They serve to unify his ontology and epistemology. As he says in a letter to Guillaume Gibieuf (1583–1650), dated 19 January 1642, “I am certain that I can have no knowledge of what is outside me except by means of the ideas I have within me.”.

  4. 17th-century philosopher Descartes’ exultant declaration — “I think, therefore I am” — is his defining philosophical statement. This article explores its meaning, significance, and how it altered the course of philosophy forever.

  5. René Descartes is often credited with being theFather of Modern Philosophy.” This title is justified due both to his break with the traditional Scholastic-Aristotelian philosophy prevalent at his time and to his development and promotion of the new, mechanistic sciences.

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  7. In Principles of Philosophy, Descartes explained, "we can clearly perceive a substance apart from the mode which we say differs from it, whereas we cannot, conversely, understand the mode apart from the substance".

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