EP- Philosophical Scepticism

Premise + conclusion dream argument - 3 waves of doubt

P1. In order to know about the nature of the external world , I need to be certain I am not dreaming

P2. In order to be certain , dreams would have to be subjectively distinguishable from veridical experience

P3. Vivid dream subjectively indistinguishable from a possible veridical experience

C. Therefore , I cannot be certain I am not dreaming now , so I cannot know anything of what the external world is like

Premise + conclusion evil demon argument - 3 waves of doubt

P1. Possible evil demon continuously deceiving me of all my perceptions so everything true is false

P2. Know anything need to rule this out

P3. Cannot rule this out , whether my experience true/false my experience would stay the same . C. Therefore , cannot know anything

What does Descartes conclude that he can be sure about from the 3 waves of doubt ?

“ Cogito ergo sum “ I think therefore I am

Define philisophical scepticism