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Mathematics as an Educational Task Hans Freudenthal 1973 edition
Mathematics as an Educational Task
Hans Freudenthal
Putting them in the front of the book is a feeble reflection of what, in the style of mathe matics treatises and textbooks, I usually call thf didactical inversion: to be fit to print, the way to the result should be the inverse of the order in which it was found;
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