ABSTRACT
The subjunctive condition serves to exclude cases of the sort first described by Edmund Gettier, such as the following. The subjunctive condition is powerful and intuitive, not so easy to satisfy, yet not so powerful as to rule out everything as an instance of knowledge. The subjunctive condition also handles nicely cases that cause difficulties for the view that people know that p when people can rule out the relevant alternatives to p in the context. The person in the tank does not know he is there, because his belief is not sensitive to the truth. Although it is caused by the fact that is its content, it is not sensitive to that fact. The operators of the tank could have produced any belief, including the false belief that he wasn't in the tank; if they had, he would have believed that. Perfect sensitivity would involve beliefs and facts varying together.
