Full Idea
De re necessity does not differ from de dicto necessity in respect of how it arises: it is still a form of conceptual necessity.
Gist of Idea
De re necessity is a form of conceptual necessity, just as de dicto necessity is
Source
Graeme Forbes (The Metaphysics of Modality [1985], 9.4)
Book Reference
Forbes,Graeme: 'The Metaphysics of Modality' [OUP 1985], p.232
A Reaction
[Forbes proceeds to argue for this claim] Forbes defends a form of essentialism, but takes the necessity to arise from a posteriori truths because of the a priori involvement of other concepts (rather as Kripke argues).
Related Idea
Idea 13810 The source of de dicto necessity is not concepts, but the actual properties of the thing [Forbes,G]