Full Idea
The topic-neutrality of logic need not mean there is a pure subject matter for logic; rather, that the logician may need to go everywhere, into mathematics and even into metaphysics.
Gist of Idea
If logic is topic-neutral that means it delves into all subjects, rather than having a pure subject matter
Source
Stephen Read (Formal and Material Consequence [1994], 'Logic')
Book Reference
'Philosophy of Logic: an anthology', ed/tr. Jacquette,Dale [Blackwell 2002], p.245