Property FW and 1-dimensional piecewise groups

Cornulier, Yves

Comptes Rendus. Mathématique, Tome 359 (2021) no. 1, pp. 71-78.

Property FW is a natural combinatorial weakening of Kazhdan’s Property T. We prove that the group of piecewise homographic self-transformations of the real projective line, has “few” infinite subgroups with Property FW. In particular, no such subgroup is amenable or has Kazhdan’s Property T. These results are extracted from a longer paper. We provide a complete proof, whose main tools are the use of the notion of partial action and of one-dimensional geometric structures.

Classification : 57S05, 57M50, 57M60, 20F65, 22F05, 53C10, 57S25

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