This chapter sets out a radical sceptical argument: (S1) I am unable to know the denials of radical sceptical hypotheses. (S2) If I am unable to know the denials of radical sceptical hypotheses, then I am unable to possess much of the everyday knowledge which I typically attribute to myself. (SC) I am unable to possess much of the everyday knowledge which I typically attribute to myself. The motivation for (S1) is meant to come from reflecting on the nature of radical sceptical hypotheses. The motivation for (S2) is meant to come from the highly plausible closure principle. And since (S1) and...

This chapter sets out a radical sceptical argument: (S1) I am unable to know the denials of radical sceptical hypotheses. (S2) If I am unable to know the denials of radical sceptical hypotheses, then I am unable to possess much of the everyday knowledge which I typically attribute to myself. (SC) I am unable to possess much of the everyday knowledge which I typically attribute to myself. The motivation for (S1) is meant to come from reflecting on the nature of radical sceptical hypotheses. The motivation for (S2) is meant to come from the highly plausible closure principle. And since (S1) and (S2) entail (SC), we have thus motivated radical scepticism.