You have chosen 'Frege philosophy of mathematics' by Michael Dummett, 'Pref to new 'Materialist Theory'' by David M. Armstrong and 'Concerning the Author' by Charles Sanders Peirce
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |