You have chosen 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer, 'Introduction to Zermelo's 1930 paper' by Michael Hallett and 'In Defense of Absolute Essentialism' by Graeme Forbes
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| A. | Speculations on Nature | |
| B. | Natural Kinds | |
| C. | Causation | |
| D. | Laws of Nature |