You have chosen 'A Combinatorial Theory of Possibility' by David M. Armstrong, 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer and 'Causal and Metaphysical Necessity' by Sydney Shoemaker
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |