Titlebook: Selected Regular Lectures from the 12th International Congress on Mathematical Education; Sung Je Cho Book 2015 Springer International Pub

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,Teachers Learning Together: Pedagogical Reasoning in Mathematics Teachers’ Collaborative Conversati group, epistemic stance on mathematics teaching, and locally negotiated standards of representational adequacy. Together, these aspects of teacher talk differently organize opportunities for professional learning.

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Understanding the Nature of the Geometric Work Through Its Development and Its Transformations,gural, instrumental and discursive) could clarify the transformation of geometric knowledge in school context. The argumentation is supported on the framework of Geometrical paradigms and Spaces for Geometric Work that articulates two basic views on a geometer’s work: cognitive and epistemological.

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,Mathematical Problem Solving Beyond School: Digital Tools and Students’ Mathematical Representationms involving motion are the basis for the analysis of students’ digital answers and an opportunity to look at the ways in which their conceptualisations emerge from a blend of pictorial and schematic digital representations.

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Mathematical Thinking Styles in School and Across Cultures, to secondary school. Within the current MaTHSCu-project the styles are measured quantitatively by comparing mathematical thinking styles in eastern and western cultures. This study is introduced and first results are shown. Finally conclusions and implications for school are drawn.

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