You have chosen 'A Résumé of Metaphysics' by Gottfried Leibniz, 'The Nature of Mathematics' by Charles Sanders Peirce and 'The Foundations of Empirical Knowledge' by A.J. Ayer
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |