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Method/knowledge/Nozick: Problem: Some statements are such that if they were wrong, we do not use the methods by which they are true: E.g. There are eyes - E.g. I live - E.g. I am sentient - E.g. I sometimes stand with something in relation - E.g. A grandmother sees his grandson safe when he comes to visit her. But if he were dead, others would tell her he was fine, to spare her agitation. Nevertheless, this does not mean that she does not know if he is all right when she sees him. : Here it was important to keep a method fixed - here the method is to see and not hearsay. - How do we know which method someone uses? - We need to keep them fixed and observe covariance.
Problem: thus we assume the method already. - Solution: know through other methods that a method is- needed but that is only possible at higher levels. - E.g. If you are irrational, you will think that you are rational - But the outsider sees that you apply irrational methods. - Problem: we cannot say that (3) is satisfied
(3) If p were not true, and the subject S uses method M, then he would not believe via M, that p is true.
We could only do this, when the methods are likely to vary. - Problem: to say that if method M would not be needed now, M would now indicate that it would now not be needed. - Solution: intersubjectivity: the person appears to be irrational to others. - Thereby, the method does not seem to need a change.
Philosophical Explanations Oxford 1981
The Nature of Rationality 1994