You have chosen 'Elucidation of some points in E.Schröder' by Gottlob Frege, 'The Principles of Mathematics' by Bertrand Russell and 'Ancient Thought in Modern Physics' by Werner Heisenberg
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |