You have chosen 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo, 'Maxims and Reflections' by Wolfgang von Goethe and 'Truth by Convention' by Willard Quine
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |