You have chosen 'Frege's Concept of Numbers as Objects' by Crispin Wright, 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton and 'Second Commentary on 'Isagoge'' by Boethius
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |