Mercuriale de groupes et de relations
D. Gaboriau
Article publié :
C. R. Acad. Sci. Paris Sér. I Math. 326 no. 2 (1998) 219-222.
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Abstract :
The cost is a dynamical invariant of discrete groups and equivalence
relations. Establishing a list of prices
(mercuriale), we show that it is not trivial for some non amenable
groups. It enables us to prove that
measure preserving free actions of free groups of different ranks on
probability spaces cannot be orbit equivalent.