Combining Texts

All the ideas for 'Ethics: Inventing Right and Wrong', 'The Concept of Logical Consequence' and 'Laudatio: Prof Ruth Barcan Marcus'

expand these ideas     |    start again     |     specify just one area for these texts

---

6 ideas

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

15130

If a property is possible, there is something which can have it [Williamson]

5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence

18812

Split out the logical vocabulary, make an assignment to the rest. It's logical if premises and conclusion match [Tarski, by Rumfitt]

5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=

13344

X follows from sentences K iff every model of K also models X [Tarski]

5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models

13343

A 'model' is a sequence of objects which satisfies a complete set of sentential functions [Tarski]

19. Language / E. Analyticity / 1. Analytic Propositions

13345

Sentences are 'analytical' if every sequence of objects models them [Tarski]

22. Metaethics / A. Ethics Foundations / 1. Nature of Ethics / f. Ethical non-cognitivism

4761	The 'error theory' of morals says there is no moral knowledge, because there are no moral facts [Mackie, by Engel]