You have chosen 'An Axiomatization of Set Theory' by John von Neumann, 'The Approach to Metaphysics' by Charles Sanders Peirce and 'Frege's Distinction of Sense and Reference' by Michael Dummett
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |