You have chosen 'works' by Gottlob Frege, 'Contrib to Critique of Hegel's Phil of Right' by Karl Marx and 'Mathematical Thought from Ancient to Modern Times' by Morris Kline
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |