You have chosen 'Realism in Mathematics' by Penelope Maddy, 'Principles of Nature and Grace based on Reason' by Gottfried Leibniz and 'Defending the Axioms' by Penelope Maddy
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |