Summary |
The issue with armchair knowledge concerns a reductio ad absurdum, designed to show incompatibilism--the view that content externalism precludes apriori knowledge of one's own mental contents. The contention is that, if we had such knowledge under externalism, it would be possible to know apriori contingent facts about the external world. Put briefly, externalist thought experiments would show apriori that possessing the water concept requires the existence of water. And apriori self-knowledge would provide apriori knowledge that you possess the water concept. But given these bits of apriori knowledge, one could then deduce apriori that water exists. Whether this reductio is cogent is what animates the debates here. |