Ideas from 'Ignorance: a Case for Scepticism' by Peter Unger [1975], by Theme Structure

[found in 'Ignorance: a Case for Scepticism' by Unger,Peter [OUP 1975,0-19-824417-7]].

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13. Knowledge Criteria / C. External Justification / 6. Contextual Justification / b. Invariantism
The meaning of 'know' does not change from courtroom to living room
13. Knowledge Criteria / D. Scepticism / 1. Scepticism
No one knows anything, and no one is ever justified or reasonable
13. Knowledge Criteria / D. Scepticism / 4. Demon Scepticism
An evil scientist may give you a momentary life, with totally false memories