The problem of knowledge 2. Scepticism under attack 3. Scepticism regarding the senses 4. Empiricist psychology 5. Idea-ism, appearance and reality 6. Primary and secondary qualities 7. Berkeley: idea-ism becomes idealism 8. Hume: idea-ism becomes irrationalism 9. Countering Hume on induction 10. The Rationalist alternative 11. Rationalism defended: Descartes 12. Kant and the synthetic a priori 13. Alternative geometries 14. Truth and truth-theories 15. Fallibilist realism.
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A 1993 study studied this question.