You have chosen 'On the Question of Absolute Undecidability' by Peter Koellner, 'On the Concept of Number' by David Hilbert and 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |