Oh man I have a story about this. But What is the Intervention?https://spottedtoad.wordpress.com/2016/01/21/but-what-is-the-intervention/ …
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A friend of mine was doing a phd in mathematics education. Her advisor had invented a software system for teaching set theory and was using it with calculus students. Her dissertation topic was to show how well this system helped students learn calculus.
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Her work showed that the system was useless at best and actively harmful to slower students. She had to drop out of the program because she would never have been allowed to graduate with those results.
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Replying to @St_Rev
How bizarre (and utterly fascinating) -- just offhand, I'd have thought her thesis was correct. (to qualify this, I'm NOT a professional mathematician or the like: purely amateur; still, though)
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The point is, the system was created by her dissertation advisor. She was expected to show it was effective.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.