Geodesic
Amenable actions of amalgamated free products
Soyoung Moon1
1Université de Neuchâtel, Switzerland
Groups, geometry, and dynamics, Tome 4 (2010) no. 2, pp. 309-332

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DOI

We prove that the amalgamated free product of two free groups of rank two over a common cyclic subgroup admits an amenable, faithful, transitive action on an infinite countable set. We also show that any finite index subgroup admits such an action, which applies for example to surface groups and fundamental groups of surface bundles over S1.
DOI : 10.4171/ggd/85
Classification : 43-XX, 20-XX, 57-XX, 00-XX
Mots-clés : Amenable actions, amalgamated free products

Soyoung Moon  1

1 Université de Neuchâtel, Switzerland 
Soyoung Moon. Amenable actions of amalgamated free products. Groups, geometry, and dynamics, Tome 4 (2010) no. 2, pp. 309-332. doi: 10.4171/ggd/85
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     title = {Amenable actions of amalgamated free products},
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     pages = {309--332},
     year = {2010},
     volume = {4},
     number = {2},
     doi = {10.4171/ggd/85},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/85/}
}
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