“Skepticism is not irrefutable, but obviously nonsensical, when it tries to raise doubts where no questions can be asked. For doubt can exist only where question exists, a question only where an answer exists, and an answer only where something can be said.” Ludwig Wittgenstein
If my world is a dream made up by evil deceiver, then all historic figures, also Descartes, are just weird details of the dream. I think it undermines Descartes' thesis "I think, therefore I am" if it turns out Descartes never existed.
I think that I'm thinking that I am, but really I'm a computer simulation of a person thinking they can think what they are, therefore they never really existed. 🙃
Isn't the problem a logical falacie? One of the premises is false therefore the problem can't be solved. The false claim that I could be in the matrix. There is no evidence to support that so it's highly improbable, therefore I don't believe it on its merits. The examples you give about personal perveptions though makes global skeptisism important when you are experiencing abnormal cognitive and sensory perception. Which causes you to have false perceptions of the real world that people without congnitive and sensory imparement are not experiencing. Normally one would trust their experiences as being real, but the body and mind can be decieved or broken in some way. Therefore some times doubting experiences could be a good thing.
