1
Revisiting mathematics education : China lectures [E-Book] /
Other Personal Name(s): ...Freudenthal, Hans...

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2
Didactical phenomenology of mathematical structures / [E-Book]
3
Linear lie groups [E-Book] /
Other Personal Name(s): ...Freudenthal, Hans...

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4
Lincos [E-Book] : design of a language for cosmic intercourse /