01032nam0 2200301 450 991034123970332120191024120017.00-9539983-6-320191024d2002---- km y0itay50 baengUKa a 001yyProceedings of the 26th conference of the international group for the psychology of mathematics education 21-26 July 2002Editors: Anne D Cockburn, Elena NardiNorwich, UKUniversity of East Anglia20024 v.21 cmPsychology of Mathematics Education26Educazione matematica372.7D Cockburn,AnneNardi,ElenaITUNINAREICATUNIMARCBK9910341239703321CPDM-97-104senza inv.MA1MA1MSCProceedings of the 26th conference of the international group for the psychology of mathematics education 21-26 July 20021565369UNINA