Full Idea
A Humean conception of reality lies behind, and motivates, the development of extensional logics with extensional semantics.
Gist of Idea
Humean conceptions of reality drive the adoption of extensional logic
Source
Brian Ellis (Scientific Essentialism [2001], 8.04)
Book Reference
Ellis,Brian: 'Scientific Essentialism' [CUP 2007], p.269
A Reaction
His proposal seems to be that it rests on the vision of a domain of separated objects. The alternative view seems to be that it is mathematics, with its absolute equality between 'objects', which drives extensionalism.