Gettier's Argumentative Analysis

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Suppose further that the putative dog is actually a robot dog so perfect that it could not be distinguished from an actual dog by vision alone. James does not know that such robot dogs exist; a Japanese toy manufacturer has only recently developed them, and what James sees is a prototype that is used for testing the public's response. Given these assumptions, (5) is of course false. But suppose further that just a few feet away from the robot dog, there is a real dog, concealed from James's view. Given this further assumption, James's belief in (5) is true. And since this belief is based on ordinary perceptual processes, most epistemologists will agree that it is justified. But as in Gettier's original cases, James's belief appears to be true