Full Idea
My doctrine is that the peculiarity of the logical constants resides precisely in that given a certain pure notion of truth and consequence, all the desirable semantic properties of the constants are determined by their syntactic properties.
Gist of Idea
With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically
Source
Ian Hacking (What is Logic? [1979], §09)
Book Reference
'A Philosophical Companion to First-Order Logic', ed/tr. Hughes,R.I.G. [Hackett 1993], p.238
A Reaction
He opposes this to Peacocke 1976, who claims that the logical connectives are essentially semantic in character, concerned with the preservation of truth.