 1928 Conflict over the Bologna conference. The German mathematicians are, for the first time since the ending of World War I, admitted to an international conference again, but not quite as equals. Brouwer insists that this is not fair, and that the conference should therefore be boycotted. Hilbert, who does not share this view, is much chagrined by Brouwer’s action and attends the conference as the leader of the German delegation, the largest present.