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@robertkaplinsky I'm function from memory, as the book is at the office. But I came across it c. 1996 in Freudenthal's Revisiting Mathematics Education: China Lectures. https://t.co/1SoXydKerJ
@robertkaplinsky I'm function from memory, as the book is at the office. But I came across it c. 1996 in Freudenthal's Revisiting Mathematics Education: China Lectures. https://t.co/1SoXydKerJ