  Let $X = \left\{P \in [0,1]^{\bf N} : \left(\forall \nu \in {\bf N} \right)
\left(P \left(\{\nu \} \right) > 0 \right) \wedge \sum\limits_{\nu =
0}^{\infty} P \left(\{\nu \} \right) = 1 \right\} $ be the Polish space of
probability measures on ${\bf N}$, each of which assigns positive probability
to every elementary event, while for any $P \in X$, let ${\Gamma}_{P} =
\left\{\xi \in L^{1}({\bf N}, P) : \left(\forall \nu \in {\bf N} \right)
\left(\xi (\nu) > 0 \right) \wedge \sum\limits_{\nu = 0}^{\infty} \xi (\nu) P
\left(\{\nu \} \right) = 1 \right\} $ and let ${\Phi}_{P} : {\Gamma}_{P} \ni
\xi \mapsto {\Phi}_{P}(\xi) \in X$ be defined by the relation
$\left({\Phi}_{P}(\xi) \right) \left(\{\nu \} \right) = \xi (\nu) P \left(\{\nu
\} \right) $, whenever $\nu \in {\bf N}$. If we consider the equivalence
relation $E = \left\{(P,Q) \in X^{2} : \left(\exists \xi \in {\Gamma}_{P}
\right) \left(Q = {\Phi}_{P}(\xi) \right) \right\} $, the Polish space ${\bf P}
= \left\{{\bf x} \in {\ell}^{1} \left({\bf R} \right) : \left(\forall n \in
{\bf N} \right) \left({\bf x}(n) > 0 \right) \right\} $ and the commutative
Polish group ${\bf G} = \left\{{\bf g} \in (0, \infty)^{\bf N} : \lim\limits_{n
\rightarrow \infty}{\bf g}(n) = 1 \right\} $, while we set $\left({\bf g} \cdot
{\bf x} \right) (n) = {\bf g}(n){\bf x}(n)$, whenever ${\bf g} \in {\bf G}$,
${\bf x} \in {\bf P}$ and $n \in {\bf N}$, then $E$ is definable and it admits
a strong approximation by the turbulent Polish group action of ${\bf G}$ on
${\bf P}$.
