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**"new math" of the 70-ies. Yikes, or nostalgy ?**

Maybe I'm committing a crime towards my oldest son (10 y.o.), but I (with difficulty) got my hands on some "new math" handbooks from the 60-ies (from Georges Papy, the "new math" gourou in Belgium), and I try to teach it to him at a leisurely pace.

I was trying to find any positive material on that new math thing from the 70-ies, but no matter how hard I google, it seems to be encountered with an almost unanimous "yikes" apprehension.

Nevertheless, I was brought up with "new math" and I absolutely loved it. I still get a thrill when I browse through the pages of those old books (back then I had other books, I don't remember which ones). Not so long ago I got back into contact with an old schoolmate of mine, and she told me (to my great surprise) that it had been sheer horror to her (I remember she was a good student so this surprised me).

Just to be clear: the "new math" I'm talking about was the re-foundation of high school mathematics based on (naive) set theory, including a revision of Euclidean geometry in set language. The main concepts were relations and functions (defined as specific kinds of relations) between sets, and algebraic structures (groups, fields, rings). I have to say that I have had enthusiastic and rather good high school math teachers. To me, the way that that material was brought was not only crystal-clear but also rather exciting, and that's the impression I would like to leave to my son.

But apparently, to most if not all people that have something to say about those "new math", it was a total failure that "destroyed" a whole generation of students.

Do people have comments on the new math thing and was it a good or a bad thing according to you ? Was it sad or justified that it was taken away (is it really taken away btw ?).