Full Idea
Frege seems to assimilate vagueness to incompleteness of definition.
Gist of Idea
Vagueness is incomplete definition
Source
report of Gottlob Frege (Grundlagen der Arithmetik (Foundations) [1884]) by Kathrin Koslicki - Isolation and Non-arbitrary Division 2.1
Book Reference
-: 'Synthese' [-], p.408