considered virtual knowledge regard justified beliefs unmitigated skepticism rejects claims virtual strong knowledge ref name skepticism characterizing knowledge strong weak virtual genuine determined differently depending person 's viewpoint well characterization knowledge ref name skepticism notable attempts respond unmitigated skepticism include direct realism disjunctivism common sense philosophy pragmatism fideism fictionalism schools thought epistemology empiricism david hume one staunch defenders empiricism empiricism view theory knowledge focuses
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