You have chosen 'works (all lost)' by Aristippus the elder, 'Phil of Mathematics and Natural Science' by Hermann Weyl and 'A Plea for Substitutional Quantification' by Charles Parsons
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |