Glasner, YairMonod, Nicolas2008-10-292008-10-292008-10-29200710.1112/blms/bdl011https://infoscience.epfl.ch/handle/20.500.14299/30503We investigate the class of groups admitting an action on a set with an invariant mean. It turns out that many free products admit such an action. We give a complete characterisation of such free products in terms of a strong fixed point property.text::journal::journal article::research article