You have chosen 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer, 'Frege versus Cantor and Dedekind' by William W. Tait and 'Papers of 1918' by Bertrand Russell
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |