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The complaint here is about not having access to solutions for problem sets. On the one hand I can see why this would be annoying, on the other hand part of learning math is about coming up with your own questions and answers, a skill that is hard to develop if all the answers are just handed to the students.

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There's a pretty solid literature on math pedagogy, and it's clear from that research that students need some way to tell when their answers are right or wrong, so that they can learn from the mistakes. For homework, that could mean getting problem sets back with the wrong answers marked. But it sounds like these were just practice problem sets, so the students literally had not way to tell if they were doing them right or not.

Then maybe Harvard is not the best place to learn mathematics.

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