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the book presents the invited lectures given at 13th international congress on mathematical education (icme-13). Icme-13 took place from 24th- 31st july 2016 at the university of hamburg in hamburg (germany). The congress was hosted by the society of didactics of mathematics (gesellschaft für didaktik der mathematik - gdm) and took place under the auspices of the international commission on mathematical instruction (icmi). Icme-13 – the biggest icme so far - brought together about 3500 mathematics educators from 105 countries, additionally 250 teachers from german speaking countries met for specific activities. The scholars came together to share their work on the improvement of mathematics education at all educational levels.. The papers present the work of prominent mathematics educators from all over the globe and give insight into the current discussion in mathematics education.
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