Margin for error and the transparency of knowledge

@article{Dokic2007MarginFE,
  title={Margin for error and the transparency of knowledge},
  author={J{\'e}r{\^o}me Dokic and Paul {\'E}gr{\'e}},
  journal={Synthese},
  year={2007},
  volume={166},
  pages={1-20}
}
In chapter 5 of Knowledge and its Limits, T. Williamson formulates an argument against the principle (KK) of epistemic transparency, or luminosity of knowledge, namely “that if one knows something, then one knows that one knows it”. Williamson’s argument proceeds by reductio: from the description of a situation of approximate knowledge, he shows that a contradiction can be derived on the basis of principle (KK) and additional epistemic principles that he claims are better grounded. One of them… 

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