You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'Completeness of Axioms of Logic' by Kurt Gdel and 'Logic in Mathematics' by Gottlob Frege
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |