Abstract :
[en] The object of study of this work is the invariant characteristics of filtrations
in discrete, negative time, pioneered by Vershik. We prove the equivalence
between I-cosiness and standardness without using Vershik’s standardness criterion.
The equivalence between I-cosiness and productness for homogeneous filtrations is
further investigated by showing that the I-cosiness criterion is equivalent to Vershik’s
first level criterion separately for each random variable. We also aim to derive
the elementary properties of both these criteria, and to give a survey and some
complements on the published and unpublished literature.
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