A conditional 0-1 law for the symmetric sigma-field

Details A conditional 0-1 law for the symmetric sigma-field A conditional 0-1 law for the symmetric sigma-field

2007-05-21

arxiv.org/abs/0705.3028v1

Mathematics

Probability

9 pages

Scientific paper

Let (\Omega,\mathcal{B},P) be a probability space, \mathcal{A} a sub-sigma-field of \mathcal{B}, and \mu a regular conditional distribution for P given \mathcal{A}. For various, classically interesting, choices of \mathcal{A} (including tail and symmetric) the following 0-1 law is proved: There is a set A_0 in \mathcal{A} such that P(A_0)=1 and \mu(\omega)(A) is 0 or 1 for all A in \mathcal{A} and \omega in A_0. Provided \mathcal{B} is countably generated (and certain regular conditional distributions exist), the result applies whatever P is.

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