Titlebook: All Positive Action Starts with Criticism; Hans Freudenthal and Sacha la Bastide-van Gemert Book 2015 Springer Science+Business Media Dordr

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From Critical Outsider to True Authority,de. Immediately after the war the innovative spirit reached its peak in the Netherlands. By the early 1950s everything had become more or less familiar again. This was also the case in mathematics: the establishment of the Mathematisch Centrum (Mathematical Centre) was an example. In mathematics education things went on a bit more cautiously.

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,Freudenthal and the Van Hieles’ Level Theory, reason is that the results of both PhD projects not only had a strong influence on (research in the field of) didactics of mathematics in general, but certainly also on Freudenthal’s work in particular.

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