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|Probability Function||I 164
probability function / Fraassen: is formally such thing as a mass. - We can express it in the form of volume x density. - e.g. prblty changes in time in a manner which is characterized by a constant density. - "Flow" of possible states through the region X (in phase space)) is formally like the flow of an incompressible fluid. - ((s) The density does not change). - The distribution is then still even afterwards.
B. van Fraassen
The Scientific Image Oxford 1980