Combining Texts

All the ideas for 'Letters to Varignon', 'Ontology and Mathematical Truth' and 'Counterfactuals'

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12 ideas

4. Formal Logic / F. Set Theory ST / 1. Set Theory
9967 'Impure' sets have a concrete member, while 'pure' (abstract) sets do not [Jubien]
5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
9968 A model is 'fundamental' if it contains only concrete entities [Jubien]
6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / d. Natural numbers
9965 There couldn't just be one number, such as 17 [Jubien]
6. Mathematics / B. Foundations for Mathematics / 7. Mathematical Structuralism / a. Structuralism
9966 The subject-matter of (pure) mathematics is abstract structure [Jubien]
6. Mathematics / C. Sources of Mathematics / 1. Mathematical Platonism / b. Against mathematical platonism
9962 How can pure abstract entities give models to serve as interpretations? [Jubien]
9963 If we all intuited mathematical objects, platonism would be agreed [Jubien]
9964 Since mathematical objects are essentially relational, they can't be picked out on their own [Jubien]
9. Objects / A. Existence of Objects / 2. Abstract Objects / c. Modern abstracta
9969 The empty set is the purest abstract object [Jubien]
10. Modality / B. Possibility / 8. Conditionals / c. Truth-function conditionals
14361 Lewis says indicative conditionals are truth-functional [Lewis, by Jackson]
10. Modality / B. Possibility / 9. Counterfactuals
8434 In good counterfactuals the consequent holds in world like ours except that the antecedent is true [Lewis, by Horwich]
26. Natural Theory / D. Laws of Nature / 4. Regularities / b. Best system theory
9419 A law of nature is a general axiom of the deductive system that is best for simplicity and strength [Lewis]
27. Natural Reality / G. Biology / 3. Evolution
19414 Men are related to animals, which are related to plants, then to fossils, and then to the apparently inert [Leibniz]