You have chosen 'On boundary numbers and domains of sets' by Ernst Zermelo, 'Science and Hypothesis' by Henri Poincar and 'Is Mathematics purely Linguistic?' by Bertrand Russell
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |