Full Idea
Soundness is a semantic property, unlike the purely syntactic property of consistency.
Gist of Idea
Soundness is a semantic property, unlike the purely syntactic property of consistency
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