Full Idea
Consistency is a purely syntactic property, unlike the semantic property of soundness.
Gist of Idea
Consistency is a purely syntactic property, unlike the semantic property of soundness
Source
A.George / D.J.Velleman (Philosophies of Mathematics [2002], Ch.6)
Book Reference
George,A/Velleman D.J.: 'Philosophies of Mathematics' [Blackwell 2002], p.162