Full Idea
Chalmers' two-dimensional conceivability account of possibility offers a defence of a priori conceptual analysis, and foundations on which a priori philosophy can be furthered.
Gist of Idea
If 2-D conceivability can a priori show possibilities, this is a defence of conceptual analysis
Source
Anand Vaidya (Understanding and Essence [2010], Intro)
Book Reference
-: 'Philosophia' [-], p.814
A Reaction
I think I prefer Williamson's more scientific account of possibility through counterfactual conceivability, rather than Chalmers' optimistic a priori account. Deep topic, though, and the jury is still out.
Related Idea
Idea 19258 Evaluate primary possibility from some world, and secondary possibility from this world [Chalmers, by Vaidya]