Recall the final definition of knowledge from Theaetetus :
Knowledge = True Belief + an Account
Knowledge = Justified True Belief
nows that f:
(1) P is true
(2) S believes P
(3) S is justified in believing that P
Question: What does it take to satisfy (3)?
The skeptic argues that we never satisfy the 3 condition
We are never completely justifies in our beliefs
The skeptic does not claim that our beliefs are false
Rather, argues that we could have the sam experiences if they were fal e, so our experiences can’t
Deployment of Skeptical Hypotheses
Descartes’ Evil Genius
Putnam’s BraininaVat (BIV)
The point of these hypotheses is that you experience would be exactly the same hether you were the
victim of one of the scenarios or not.
There is no way to tellwhether a skeptical hypothesis is a t play.
The evidence of the senses, of experience, would be exactly the same if you were a brain in a vat.