Ideas of R Keefe / P Smith, by Theme

[British, fl. 1997, both of Cambridge University.]

green numbers give full details    |    back to list of philosophers    |     expand these ideas

---

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

9065	S5 collapses iterated modalities (◊□P→□P, and ◊◊P→◊P)

7. Existence / D. Theories of Reality / 10. Vagueness / b. Vagueness of reality

9064	Objects such as a cloud or Mount Everest seem to have fuzzy boundaries in nature

7. Existence / D. Theories of Reality / 10. Vagueness / c. Vagueness as ignorance

9044	If someone is borderline tall, no further information is likely to resolve the question

9048	The simplest approach, that vagueness is just ignorance, retains classical logic and semantics

9055	The epistemic view of vagueness must explain why we don't know the predicate boundary

7. Existence / D. Theories of Reality / 10. Vagueness / f. Supervaluation for vagueness

9049	Supervaluationism keeps true-or-false where precision can be produced, but not otherwise

9056	Vague statements lack truth value if attempts to make them precise fail

9058	Some of the principles of classical logic still fail with supervaluationism

9059	The semantics of supervaluation (e.g. disjunction and quantification) is not classical

9060	Supervaluation misunderstands vagueness, treating it as a failure to make things precise

7. Existence / D. Theories of Reality / 10. Vagueness / g. Degrees of vagueness

9050	A third truth-value at borderlines might be 'indeterminate', or a value somewhere between 0 and 1

9061	People can't be placed in a precise order according to how 'nice' they are

9062	If truth-values for vagueness range from 0 to 1, there must be someone who is 'completely tall'

9063	How do we decide if my coat is red to degree 0.322 or 0.321?

9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects

9045	Vague predicates involve uncertain properties, uncertain objects, and paradoxes of gradual change

9047	Many vague predicates are multi-dimensional; 'big' involves height and volume; heaps include arrangement

9053	If there is a precise borderline area, that is not a case of vagueness