The Seventh Congress of the European Society for Research in Mathematics Education (ERME) took place 9-13 February 2011 at Rzeszow in Poland. ERME came into being at its first congress in Osnabrueck, Germany, in 1998. Thereafter, congresses have taken place every two years since CERME2 in 2001. From its inception, great emphasis has been placed on promoting participation by all who attend the congress, with a deliberate shift from the succession of parallel, 40-minute PowerPoint research presentations that characterise most international scientific conferences. Thus, the vast majority of CERME time is devoted to discussion and debate within thematic Working Groups (WGs). CERME participants must commit themselves to membership of just one such group and to 6 or 7 sessions of 90-420 minutes working with the group. The number of WGs increased to 17 at CERME7 and the number of participants in each was around 25-30 on average, including about 4 WG leaders. The WG themes were as follows:Argumentation and proof.
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