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Probability function/Lewis: supposed to represent the belief systems of people. - These do not need to be realistic . Probabilities: are probability functions - the indicative conditional must have a fixed interpretation for different beliefs. - This makes it a probability conditional.
Probability function/Lewis: we can imagine it as distributing probabilities over the worlds. - Each world has a probability P(W) and the probabilities of worlds add up to 1. - We get to the probability of sentences by adding up the probabilities of worlds where the sentence is true. - All probability is concentrated in the A-worlds.
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