Constituting Atoms of a $σ$ Algebra via Its Generator

Details Constituting Atoms of a $σ$ Algebra via Its Generator Constituting Atoms of a $σ$ Algebra via Its Generator

2007-11-15

arxiv.org/abs/0711.2400v3

Mathematics

Probability

8 pages

Scientific paper

To constitute atoms of a $\sigma$ algebra is not a easy task due to the large number of its elements. However, determining them via generators seems a feasible and simple way since most $\sigma$ algebras are generated by their smaller proper subsets. Precisely, under some conditions each atom of a $\sigma$ algebra equals the intersection of the elements containing a point of the atom in the generator. In this paper, a very weak sufficient condition for determining atoms by the generator is presented. The condition, though not being a necessary one, is shown to be almost the weakest one in the sense that it can hardly be improved.

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