title: Three's company when seeking unanimity.
authors.affiliation: Faculty of Mathematics, University of Vienna, Nordbergstrasse 15, 1090 Vienna, Austria. karl.sigmund@univie.ac.at
authors.forename: Karl
authors.initials: K
authors.lastname: Sigmund
mesh_terms: D006801:Humans; D007858:Learning; D008433:Mathematics; D008962:Models, Theoretical; D012984:Software