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Challenges of Lesson Study in UFRJ
Descartes’ Dream with van Schooten
Using Historical Sources on e-textbook/d-book

Masami Isoda and Yuriko Yamamoto Baldin

Sample1 : Van Schooten (1646)
Sample2 : Japanes Textbook (1943)



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DGS on TEXT



Prooving



Problem Posing



Math Activity



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