On theories of random variables

Details On theories of random variables On theories of random variables

2009-01-12

arxiv.org/abs/0901.1584v3

Mathematics

Logic

Scientific paper

We study theories of spaces of random variables: first, we consider random variables with values in the interval $[0,1]$, then with values in an arbitrary metric structure, generalising Keisler's randomisation of classical structures. We prove preservation and non-preservation results for model theoretic properties under this construction: i) The randomisation of a stable structure is stable. ii) The randomisation of a simple unstable structure is not simple. We also prove that in the randomised structure, every type is a Lascar type.

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