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An interesting perspective. I personally didn't enjoy lectures in college when it came to technical classes (engineering, math, physics) as I had trouble keeping up. Videos help solve that though as you can go at your own pace...pause and rewind. I'm sure it will be a lot faster and reach more people faster with videos. There are so few in the APL/J world. The few ones that exist are very popular though.

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Rest assured that I haven't given up on the textbook / tutorial approach just yet, but I might have to "invent" my own publication technology to get the "book" that I want.

Would it be hard to just create a Dyalog-APL notebook (I recall Dyalog added support for that recently) and export as PDF?

I find Jupyter notebooks in Python and Wolfram's Mathematica to be nearly perfect for explaining complicated content where you can easily format text, images, and inline code snippets.

I have started something along these lines.

github.com/rikedyp/learnapl

It is currently very rough around the eges and also in the middle. Work will continue in the new year.

There is also now a set of introductory problem sets that have been used in a couple of schools on problems.tryapl.org

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