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Full Idea
Deontic modality can be divided into sentence-modifying 'ought-to-be' modals, and predicate-modifying 'ought-to-do' modals.
Gist of Idea
Deontic modalities are 'ought-to-be', for sentences, and 'ought-to-do' for predicates
Source
Barbara Vetter (Potentiality [2015], 6.9.2)
Book Ref
Vetter,Barbara: 'Potentiality: from Dispositions to Modality' [OUP 2015], p.239
A Reaction
[She cites Brennan 1993] These two seem to correspond to what is 'good' (ought to be), and what is 'right' (ought to do). Since I like that distinction, I also like this one.
| 14971 | D is valid on every serial frame, but not where there are dead ends [Cresswell] |
| 13114 | □P → P is not valid in D (Deontic Logic), since an obligatory action may be not performed [Fitting/Mendelsohn] |
| 9743 | The system D has the 'serial' conditon imposed on its accessibility relation [Fitting/Mendelsohn] |
| 13706 | Intuitively, deontic accessibility seems not to be reflexive, but to be serial [Sider] |
| 13710 | In D we add that 'what is necessary is possible'; then tautologies are possible, and contradictions not necessary [Sider] |
| 19033 | Deontic modalities are 'ought-to-be', for sentences, and 'ought-to-do' for predicates [Vetter] |