You have chosen 'A Realistic Theory of Categories' by Roderick Chisholm, 'A Tour through Mathematical Logic' by Robert S. Wolf and 'Frege's Concept of Numbers as Objects' by Crispin Wright
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |