How does Descartes prove the existence of the External world?

René Descartes, the 17th-century French philosopher, is famous for his rigorous method of doubt and his quest for indubitable knowledge. In his philosophical endeavors, Descartes sought to establish a foundation for knowledge that would withstand skeptical challenges. While Descartes doubted nearly everything, including the existence of the external world, he ultimately arrived at a solution that aimed to prove the existence of the external world. Here is how Descartes attempted to do so:

1. Cogito, Ergo Sum (I Think, Therefore I Am): Descartes famously begins his philosophical journey with radical doubt. He questions everything he believes to be true, including the existence of the external world. However, he encounters a foundational certainty when he realizes that the act of doubt itself is a form of thinking, and therefore, he must exist as a thinking thing. This insight leads to his famous dictum, "Cogito, ergo sum" ("I think, therefore I am").

   • Significance: Descartes argues that while he can doubt the existence of the external world, he cannot doubt the existence of himself as a thinking, doubting being. The existence of the thinking ________ __________ __________ __________ ____ _____ _________ ________ _______.
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