You have chosen 'Philosophy of Mathematics' by Leon Horsten, 'Letters to Samuel Clarke' by Gottfried Leibniz and 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |