You have chosen 'Elements of Mathematical Logic' by Jan Lukasiewicz, 'The Decline of the West' by Oswald Spengler and 'The Epistemology of Essence (draft)' by Tuomas E. Tahko
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |