Full Idea
The difference between de re and de dicto formulae is a difference between formulae which are, and formulae which are not, sensitive to the identities of objects at various worlds.
Gist of Idea
De re modal formulae, unlike de dicto, are sensitive to transworld identities
Source
Graeme Forbes (The Metaphysics of Modality [1985], 3.1)
Book Reference
Forbes,Graeme: 'The Metaphysics of Modality' [OUP 1985], p.49
Related Idea
Idea 13717 Transworld identity is not a problem in de dicto sentences, which needn't identify an individual [Sider]