Ideas from 'Epistemic Operators' by Fred Dretske [1970], by Theme Structure

[found in 'Skepticism' (ed/tr DeRose,K /Warfield,Ted) [OUP 1999,0-19-511827-8]].

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13. Knowledge Criteria / A. Justification Problems / 2. Justification Challenges / c. Knowledge closure
You have knowledge if you can rule out all the relevant alternatives to what you believe