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Re:Notes on Discrete Mathematics (2017) [pdf] by mhneu on Monday June 25, 2018 @09:24AM (#17392183)
Teaching styles differ and student populations differ.

And re: in-depth, this is a long tail problem. The profit is in the mainstream, not in the tail. Producing really good in-depth work isn’t that rewarding because the market is small.

Re:Notes on Discrete Mathematics (2017) [pdf] by wbhart on Monday June 25, 2018 @03:44PM (#17395201)
I'm still talking about undergraduate mathematics here. There's billions of dollars spent worldwide on providing exactly that. The issue is that a standard undergraduate course, especially in mathematics, is quite deep, relative to, for example, a YouTube "science" video.

On the other hand, technology offers new and interesting ways to disseminate this knowledge, but I see very little at the same depth as a standard undergraduate course, which is not just a video of someone doing the equivalent of a chalk-and-talk.