License

Unfathoming (this website) © 2024 by Du Cheng is licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International and 10 years after its publication, each piece of writing (and all drawings, diagrams, code, and pictures) enters the public domain via CC0. Check the publication date of a page you’re interested in, add 10 years, and that will tell you when it enters the public domain.

Rationale (not part of the license)

I picked the CC BY-NC-ND 4.0 license because I want people to be able to freely share my work, but I recognize that textbook publishers and other terrible organizations (looking at you: Cengage, Pearson, and McGraw Hill) will try to monetize my work without giving back. By making attribution required, and by disallowing commercial use and derivative work, I can ensure that my work is freely shared by those with pure intentions, while making it unattractive towards those who wish to monetize it.