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How is knowledge obtained, according to O'ism?

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What are your thoughts on Robert Nozick's formulation of JTB. person X knows that p if all of the following conditions are satisfied:

(i) p is true.

(ii) X believes that p.

(iii) If p were not true, X would not believe that p.

(iv) If p were true, X would believe that p.

 

I think the problems with subjectivism that David highlighted earlier still stand, no?

4 follows 1 and 2 (P ∧ B ⇒ P → B ). 3 may be meaningless ("if it were..." can not in general be given consideration). Technically (rationalism alert), 3 follows 1 (P ⇒ ¬P →Anything).

 

There may also be problems with treating mental grasp of reality as propositional. I admit I haven't thought about this much, but don't all propositions outside of those purely about booleans (e.g. A ∨ ¬A) use the form Concept(object)?

Edited by rowsdower
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