Gettier makes a very specific statement (Jones is the man who will get the job, and Jones has ten coins in his pocket), and from that he deduces a very generalized statement, (The man who will get the job has ten coins in his pocket.) However, it is not clear who ‘the man’ refers to here. If ‘the man’ refers to Jones then the statement is false, because Jones is not the man who gets the job. If ‘the man’ refers to Smith, then Smith would be making a statement without any justification, since he believes that Jones will get the job. The first possibility violates the truth requirement for justified true belief, while the second case violates the justification requirement. Gettier has tried to use semantic obscurity to trick the reader into believing that justified true belief is not enough for knowledge. However, it can be seen that in this case the ‘knowledge’ was either not justified or false, and thus never constituted knowledge in the first place.
This second example cannot be accepted because it contains an inherent logical flaw. Gettier uses an example in the form of ‘either a or b, not a, therefore b’. However, this form of logic can ‘prove’ an infinite number of impossibilities. For example, I have reason to believe that Brown is in Barcelona, so I say “Either cows fly or Brown is in Barcelona.” It turns out Brown is now in Amsterdam, therefore, cows fly. This is obviously impossible, thus showing that the formula can’t be used to prove anything – or else it could be used to prove everything!
You cannot claim here to know a proposition which randomly happened to be true just because its complementary proposition which you thought was true wasn’t. This is the wrong ‘justification’. Conclusions derived using this logical sleight-of-hand cannot be considered knowledge.
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