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Re:Free and Open-Source Mathematics Textbooks by gmfawcett on Saturday December 21, 2019 @09:19AM (#21851268)
You might also enjoy /r/mathbooks (and /r/csbooks) on Reddit, where people post links to freely-published math and CS textbooks. Most are not open-source, but all are shared with permission from their authors and publishers.

https://www.reddit.com/r/mathbooks/

https://www.reddit.com/r/csbooks/

Re:Free and Open-Source Mathematics Textbooks by creative-coder on Monday December 23, 2019 @12:37AM (#21861703)
Thanks for pointing out these Reddit pages. I wasn't aware of these