You have chosen 'Introduction to Mathematical Logic' by Michal Walicki, 'The Structure of Objects' by Kathrin Koslicki and 'Boole calculus and the Concept script' by Gottlob Frege
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |