Practice question · Select all that apply
Which are components of a modal MODEL, as opposed to a bare frame?
Hints
- A frame has two components and a model adds a third.
- Closeness orderings are extra machinery needed only for counterfactuals.
Show the answer
- A. An accessibility relation between worlds
- B. A valuation saying which atoms hold at each world
- D. A set of worlds
Why
A frame is worlds plus accessibility; a model adds the valuation. A similarity ordering is further structure again, required only once counterfactuals are being analysed, which is exactly why they resisted analysis for so long.
Practise Modal Systems and Possible Worlds
The app has 3 more questions on this lesson, and keeps your place in the course. Philosophy I is free to start.
More questions on Modal Systems and Possible Worlds
- On Lewis’s modal realism, other possible worlds are spatiotemporally isolated from ours, which is why we…
- Which are genuine objections to using possible worlds to explain modality?
- On modal realism, 'actual' is an indexical term rather than an absolute property. What follows from this…
- Sort each position by its account of what possible worlds are.
- Arrange these developments in the order they occurred in the history of modal logic.
- In S5, any string of modal operators reduces to its final operator. Set the number of operators remaining…
- Match each branch of modal logic to what its operators range over.