You have chosen 'On boundary numbers and domains of sets' by Ernst Zermelo, 'A Short History of German Philosophy' by Vittorio Hsle and 'Letter to Frege 29.12.1899' by David Hilbert
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |