You have chosen 'Classical Cosmology (frags)' by T.M. Robinson, 'On the Nature of Mathematical Reasoning' by Henri Poincar and 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |