You have chosen 'A Puzzle about Belief' by Saul A. Kripke, 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer and 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |