Combining Texts

All the ideas for 'A priori/A posteriori', 'Fact, Fiction and Forecast (4th ed)' and 'An Introduction to Modal Logic'

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10 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / b. Terminology of PL
9540 A 'value-assignment' (V) is when to each variable in the set V assigns either the value 1 or the value 0 [Hughes/Cresswell]
4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / d. Basic theorems of PL
9541 The Law of Transposition says (P→Q) → (¬Q→¬P) [Hughes/Cresswell]
4. Formal Logic / B. Propositional Logic PL / 4. Soundness of PL
9543 The rules preserve validity from the axioms, so no thesis negates any other thesis [Hughes/Cresswell]
5. Theory of Logic / C. Ontology of Logic / 4. Logic by Convention
12394 If the result is bad, we change the rule; if we like the rule, we reject the result [Goodman]
5. Theory of Logic / K. Features of Logics / 4. Completeness
9544 A system is 'weakly' complete if all wffs are derivable, and 'strongly' if theses are maximised [Hughes/Cresswell]
8. Modes of Existence / C. Powers and Dispositions / 6. Dispositions / a. Dispositions
14292 Dispositions seem more ethereal than behaviour; a non-occult account of them would be nice [Goodman]
12. Knowledge Sources / A. A Priori Knowledge / 10. A Priori as Subjective
3913 Maybe imagination is the source of a priori justification [Casullo]
14. Science / C. Induction / 5. Paradoxes of Induction / a. Grue problem
18749 Goodman argued that the confirmation relation can never be formalised [Goodman, by Horsten/Pettigrew]
17646 Goodman showed that every sound inductive argument has an unsound one of the same form [Goodman, by Putnam]
26. Natural Theory / D. Laws of Nature / 3. Laws and Generalities
4794 We don't use laws to make predictions, we call things laws if we make predictions with them [Goodman]