display all the ideas for this combination of texts
7 ideas
| 14916 | What matters is whether a theory can predict - not whether it actually does so [Ladyman/Ross] |
| Full Idea: We suggest a modal account of novel prediction. That a theory could predict some unknown phenomenon is what matters, not whether it actually did so predict. | |
| From: J Ladyman / D Ross (Every Thing Must Go [2007], 2.1.3) | |
| A reaction: They also emphasise predicting new types of thing, rather than particular items. Some theories are powerful on explanation, but not so concerned with prediction. See Idea 14915. |
| 14915 | The theory of evolution was accepted because it explained, not because of its predictions [Ladyman/Ross] |
| Full Idea: Darwin's theory of evolution was accepted by the scientific community because of its systematizing and explanatory power, and in spite of its lack of novel predictive success. | |
| From: J Ladyman / D Ross (Every Thing Must Go [2007], 2.1.3) | |
| A reaction: I am keen on the centrality of explanation to all of our thinking, metaphysical as well as physical, so I like this one. In general I like accounts of science that pay more attention to biology, and less to physics. |
| 14922 | The Ramsey sentence describes theoretical entities; it skips reference, but doesn't eliminate it [Ladyman/Ross] |
| Full Idea: It is a mistake to think that the Ramsey sentence allows us to eliminate theoretical entities, for it still states that they exist. It is just that they are referred to not directly, by means of theoretical terms, but by description. | |
| From: J Ladyman / D Ross (Every Thing Must Go [2007], 2.4.1) |
| 14921 | The Ramsey-sentence approach preserves observations, but eliminates unobservables [Ladyman/Ross] |
| Full Idea: If one replaces the assertions of a first-order theory with its Ramsey sentence (giving a quantified predicate variable for a theoretical term), the observational consequences are carried over, but direct reference to unobservables is eliminated. | |
| From: J Ladyman / D Ross (Every Thing Must Go [2007], 2.4.1) | |
| A reaction: Thus this rewriting of theories is popular with empiricists, and this draws attention to the way you can change the ontological commitments simply by paraphrase. ...However, see Idea 14922. |
| 14953 | Induction is reasoning from the observed to the unobserved [Ladyman/Ross] |
| Full Idea: Induction is any form of reasoning that proceeds from claims about observed phenomena to claims about unobserved phenomena. | |
| From: J Ladyman / D Ross (Every Thing Must Go [2007], 4.5) | |
| A reaction: Most accounts of induction seem to imply that they lead to generalisations, rather than just some single unobserved thing. This definition is in line with David Lewis's. |
| 14914 | Inductive defences of induction may be rule-circular, but not viciously premise-circular [Ladyman/Ross] |
| Full Idea: The inductive defence of induction may be circular but not viciously so, because it is rule circular (defending the rule being used) but not premise circular (where the conclusion is in one of the premises). | |
| From: J Ladyman / D Ross (Every Thing Must Go [2007], 2.1.2) | |
| A reaction: [They cite Braithwaite 1953 and Carnap 1952 for this] This strikes me as clutching at straws, when the whole procedure of induction is inescapably precarious. It is simply all we have available. |
| 14913 | We explain by deriving the properties of a phenomenon by embedding it in a large abstract theory [Ladyman/Ross] |
| Full Idea: Theoretical explanation is the derivation of the properties of a relatively concrete and observable phenomenon by means of an embedding into some larger, relatively abstract and unobservable theoretical structure. | |
| From: J Ladyman / D Ross (Every Thing Must Go [2007], 2.1.1) | |
| A reaction: [they are citing Michael Friedman 1981 p.1] This sounds like covering law explanation, but the theoretical structure will be a set of intersecting laws, rather than a single law. How do you explain the theoretical structure? |