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Make true/truth-maker/Lewis: is logical, not causal.
Sw I 231
Truth maker-Principle/Armstrong: there must be something that makes "there are no Unicorns" true. - LewisVs - Armstrong: for properties: object (carrier) as truth-maker. - LewisVsArmstrong: it is sufficient that the object has the property. - N.B.: two worlds can then differ for the same subject matter in the distribution of properties.
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