Does the eternal world exists ? How to prove it ?
The external world is a philosophical problem set by Descartes when, in his “room with a stove”, he argued that his only rock bottom certainty was his immediate present consciousness : I think therefore i am.
The problem was to show whether, starting from there, anyone could know, and how he could know, that there was a universe around him, containing things and other people.
It should be remembered that the cartesian starting point is a subject of consciousness both solitary and incorporeal.
The skeptics cannot assert if the external world exists.