You have chosen 'Function and Concept' by Gottlob Frege, 'Completeness of Axioms of Logic' by Kurt Gdel and 'Mental Models' by P. Johnson-Laird
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A. | Justification Problems | |
B. | Internal Justification | |
C. | External Justification | |
D. | Scepticism | |
E. | Relativism |