Books on Amazon
Theoretical entities/TE/Lewis: we believe in them only because they are claimed by a new theory. - Theoretical terms: do not need to name theoretical entities. - Theoretical entities: do not need to be named by theoretical terms. - E.g. creature, too small to be observed. - Theoretical entities are not entities of a special kind - but special through the way we learn about them.
Die Identität von Körper und Geist Frankfurt 1989
Konventionen Berlin 1975
Philosophical Papers Bd I New York Oxford 1983
Philosophical Papers Bd II New York Oxford 1986
Cl. I. Lewis
Mind and the World Order: Outline of a Theory of Knowledge (Dover Books on Western Philosophy) 1991