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Abstract
One says that two ergodic systems $(X,\mathcal F,\mu)$ and $(Y,\mathcal
G,\nu)$ preserving a probability measure are evenly Kakutani equivalent if
there exists an orbit equivalence $\phi: X\to Y$ such that, restricted
to some subset $A\subseteq X$ of positive measure, $\phi$ becomes a
conjugacy between the two induced maps $T_A$ and $S_{\phi(A)}$. It follows
from the general theory of loosely Bernoulli systems developed in [8] that all adding machines are evenly Kakutani equivalent, as they
are rank-1 systems. Recent work has shown that, in systems that are
both topological and measure-preserving, it is natural to seek to
strengthen purely measurable results to be "nearly continuous''. In the
case of even Kakutani equivalence, what one asks is that the map $\phi$ and
its inverse should be continuous on $G_\delta$ subsets of full measure and
that the set $A$ should be within measure zero of being open and of being
closed. What we will show here is that any two adding machines are indeed
equivalent in this nearly continuous sense.
Mathematics Subject Classification: Primary: 28D05, Secondary: 37A20.
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