Groups of piecewise projective homeomorphisms

Abstract

The group of piecewise projective homeomorphisms of the line provides straightforward counter-examples to the so-called von Neumann conjecture. The examples are so simple that many additional properties can be established.

This version submitted to PNAS on October 22, 2012. Final version published in PNAS at http://dx.doi.org/10.1073/pnas.1218426110

References in corpus (1)

• On co-amenability for groups and von Neumann algebras

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