You have chosen 'The philosophical basis of intuitionist logic' by Michael Dummett, 'Frege on Extensions from Concepts' by Tyler Burge and 'The Logic of Scientific Discovery' by Karl Popper
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |