How does Descartes prove the existence of the External world?

René Descartes, a foundational figure in modern Western philosophy, sought to establish certainty in knowledge through his method of radical doubt. His approach to proving the existence of the external world is rooted in his epistemological project, which is articulated in his works *Meditations on First Philosophy* and *Principles of Philosophy*. Descartes' argument for the existence of the external world emerges after he has established the certainty of his own existence and the existence of God. His reasoning follows a structured progression from doubt to certainty.

### Methodological Doubt and the Cogito  
Descartes begins by doubting all his previous beliefs in order to find a foundation of absolute certainty. This methodological skepticism leads him to question the reliability of sense perception, as it can often be deceptive. He introduces the famous "Dream Argument," where he considers the possibility that all his experiences could be illusions, much like dreams ___ _______ ________ _____ _______ _______ ____ ____ _________.
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