You have chosen 'Frege's Concept of Numbers as Objects' by Crispin Wright, 'Nature and Observability of Causal Relations' by Curt Ducasse and 'Constructibility and Mathematical Existence' by Charles Chihara
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |