Full Idea
Felix Klein's so-called 'Erlangerprogramm' in geometry involved characterizing the various branches of geometry by what transformations were irrelevant to each.
Gist of Idea
Klein summarised geometry as grouped together by transformations
Source
Willard Quine (Natural Kinds [1969], p.137)
Book Reference
Quine,Willard: 'Ontological Relativity and Other Essays' [Columbia 1969], p.137