Full Idea
The central notion of model theory is the relation of 'satisfaction', sometimes called 'truth in a model'.
Gist of Idea
The central notion of model theory is the relation of 'satisfaction'
Source
Stewart Shapiro (Philosophy of Mathematics [1997], 4.9)
Book Reference
Shapiro,Stewart: 'Philosophy of Mathematics:structure and ontology' [OUP 1997], p.139